{
  "title": "Digitizing an Australian tariff offer to Finland, 1949",
  "frozen_on": "2026-09-09",
  "scope": "One documented digitization decision, not an independent accuracy benchmark.",
  "source": {
    "file": "500083-0004.pdf",
    "sha256": "b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281",
    "physical_page": 4,
    "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
    "product": "Strawpaper and strawboard",
    "image": "/evidence/australia-finland-1949-page4.jpg"
  },
  "input_sha256": "1958edb3b7e7984a4d2fe6d1faa5ae4c99854beaf8fdc2359af944fb507465c4",
  "reader_identity_ledger_sha256": "c637de3401253d0e2fec0639c0d10a53e2f967ae922403d6af642825e69ec75d",
  "independent_reviews": [
    {
      "reader": "Reader A",
      "actual_model": "gemini-3.1-pro-high",
      "source_result_sha256": "93390375b827bc59bb3c443366368c7c6e9e45e585b1930bfe8306cd211df208",
      "source_provenance_sha256": "397e2273ed43089bcfeab5ec70669fa2032f851366465a7817f18970f36ca7e4",
      "tariff_fields": {
        "currency": "£",
        "hist1930": null,
        "hist1945": null,
        "pre_m_add": null,
        "pre_m_adv": null,
        "pre_m_both": null,
        "pre_m_max_adv": null,
        "pre_m_prim": 0.1,
        "pre_m_spec": null,
        "pre_p_adv": null,
        "pre_p_both": null,
        "pre_p_prim": 0.05,
        "pre_p_spec": null,
        "pro_m_add": null,
        "pro_m_adv": null,
        "pro_m_bind": null,
        "pro_m_both": null,
        "pro_m_max_adv": null,
        "pro_m_prim": 0.05,
        "pro_m_spec": null,
        "pro_p_adv": null,
        "pro_p_both": null,
        "pro_p_prim": 0,
        "pro_p_spec": null,
        "product": "Strawpaper, strawboard other than corrugated, and boards n.e.i., of which the f.o.b. price per ton is, or is the equivalent of, in Australian currency, more than £21.5.0",
        "supplier": null,
        "tariff_item": "334(Q)(3)",
        "unit": "per ton"
      },
      "multiple_rates": "Base Rates M.F.N. specific duty: £9.18.9; B.P.T. specific duty: £3.15.0. Proposed specific rates are unchanged (Response states 'Reduction in primage' only).",
      "remark": null,
      "saved_evidence": {
        "PreRate": {
          "alternatives": [],
          "bbox": [
            0.38,
            0.378,
            0.435,
            0.428
          ],
          "confidence": 0.95,
          "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
          "quote": "£9.18.9 ... 10%",
          "rationale": "M.F.N. base rates for specific duty and primage."
        },
        "ProposedRate": {
          "alternatives": [],
          "bbox": [
            0.388,
            0.665,
            0.437,
            0.69
          ],
          "confidence": 0.95,
          "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
          "quote": "Reduction in primage ... 5%",
          "rationale": "Proposed M.F.N. response showing the new primage rate."
        }
      }
    },
    {
      "reader": "Reader B",
      "actual_model": "gpt-5.6-sol",
      "source_result_sha256": "b748f5950a54c96293ba6ca9243245cd382b2657b0ceb85364f4cb1a3336f165",
      "source_provenance_sha256": "fcf9b10b0dc3534c38d67f540cd1c5928902f9a82f192b35db092166ae1feae9",
      "tariff_fields": {
        "currency": "Australian pound (£A)",
        "hist1930": null,
        "hist1945": null,
        "pre_m_add": null,
        "pre_m_adv": null,
        "pre_m_both": null,
        "pre_m_max_adv": null,
        "pre_m_prim": 0.1,
        "pre_m_spec": 9.9375,
        "pre_p_adv": null,
        "pre_p_both": null,
        "pre_p_prim": 0.05,
        "pre_p_spec": 9.75,
        "pro_m_add": null,
        "pro_m_adv": null,
        "pro_m_bind": null,
        "pro_m_both": null,
        "pro_m_max_adv": null,
        "pro_m_prim": 0.05,
        "pro_m_spec": 9.9375,
        "pro_p_adv": null,
        "pro_p_both": null,
        "pro_p_prim": 0,
        "pro_p_spec": 9.75,
        "product": "Strawpaper, strawboard other than corrugated, and boards n.e.i., of which the f.o.b. price per ton is, or is the equivalent of, in Australian currency, more than £21.5.0",
        "supplier": null,
        "tariff_item": "334(Q)(3)",
        "unit": "per ton"
      },
      "multiple_rates": null,
      "remark": null,
      "saved_evidence": {
        "PreRate": {
          "alternatives": [],
          "bbox": [
            0.296,
            0.354,
            0.496,
            0.414
          ],
          "confidence": 0.99,
          "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
          "quote": "per ton; Primage — M.F.N. £9.18.9, 10%; B.P.T. £9.15.0, 5%",
          "rationale": "The base-date columns give specific per-ton duties and separate primage percentages. £9.18.9 converts to 9.9375 pounds and £9.15.0 to 9.75 pounds."
        },
        "ProposedRate": {
          "alternatives": [],
          "bbox": [
            0.661,
            0.35,
            0.797,
            0.414
          ],
          "confidence": 0.97,
          "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
          "quote": "Response to Finland — M.F.N.: Reduction in primage, 5%; B.P.T.: Exempt",
          "rationale": "The response changes only primage: the M.F.N. primage becomes 5% and the B.P.T. primage is exempt, represented as zero. Because no change is stated for the specific per-ton components, the base specific duties are inherited unchanged; no binding is expressed."
        }
      }
    },
    {
      "reader": "Reader C",
      "actual_model": "claude-opus-4-8",
      "source_result_sha256": "c407a04f71d323c0e29a4d8a4a7c1ab0f6869636836f4188657deef724b4f4b0",
      "source_provenance_sha256": "75759fce51b72b828f792c07b97dc2b42743e1abf391f43311ecf263b84da3da",
      "tariff_fields": {
        "currency": "£",
        "hist1930": null,
        "hist1945": null,
        "pre_m_add": null,
        "pre_m_adv": null,
        "pre_m_both": null,
        "pre_m_max_adv": null,
        "pre_m_prim": 0.1,
        "pre_m_spec": 9.9375,
        "pre_p_adv": null,
        "pre_p_both": null,
        "pre_p_prim": 0.05,
        "pre_p_spec": 3.75,
        "pro_m_add": null,
        "pro_m_adv": null,
        "pro_m_bind": null,
        "pro_m_both": null,
        "pro_m_max_adv": null,
        "pro_m_prim": 0.05,
        "pro_m_spec": null,
        "pro_p_adv": null,
        "pro_p_both": null,
        "pro_p_prim": 0,
        "pro_p_spec": null,
        "product": "Strawpaper, strawboard other than corrugated, and boards n.e.i., of which the f.o.b. price per ton is, or is the equivalent of, in Australian currency, more than £21.5.0",
        "supplier": null,
        "tariff_item": "334(Q)(3)",
        "unit": "per ton"
      },
      "multiple_rates": null,
      "remark": "Base-date (15 Oct 1946) specific customs duties are £9.18.9 per ton (M.F.N.) and £3.15.0 per ton (B.P.T.), each with separate primage (10% M.F.N., 5% B.P.T.). Finland's request is a 'Reduction in primage'. Australia's response reduces primage only: M.F.N. primage to 5%, B.P.T. primage 'Exempt' (free). The per-ton specific duties are not restated in the response and are treated as unchanged. Specific £.s.d rates converted to decimal pounds for scalar cells (£9.18.9=9.9375; £3.15.0=3.75); raw expressions preserved in evidence.",
      "saved_evidence": {
        "PreRate": {
          "alternatives": [],
          "bbox": [
            0.38,
            0.41,
            0.49,
            0.46
          ],
          "confidence": 0.9,
          "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
          "quote": "M.F.N. £9.18.9 / 10% ; B.P.T. £3.15.0 / 5%",
          "rationale": "'Rates at base date' (15 Oct 1946) columns: M.F.N. specific £9.18.9 per ton with 10% primage; B.P.T. specific £3.15.0 per ton with 5% primage."
        },
        "ProposedRate": {
          "alternatives": [],
          "bbox": [
            0.66,
            0.41,
            0.82,
            0.46
          ],
          "confidence": 0.86,
          "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
          "quote": "Response to Finland: Reduction in primage 5% (M.F.N.); Exempt (B.P.T.)",
          "rationale": "Australia's response reduces primage: M.F.N. to 5%, B.P.T. to Exempt (free). Answers Finland's request 'Reduction in primage'. Specific per-ton duties not restated (unchanged)."
        }
      }
    }
  ],
  "final_review": {
    "actual_model": "gpt-5.6-sol",
    "effort": "ultra",
    "result_sha256": "92b91b550fa0f380d4cb1549f967ed268b4f5879c6c71296a5f794c611222fc0",
    "provenance_sha256": "c98816f897c65198dafe209244ae2e4e3c69051b098b6700ad51b5b4a17e198c",
    "tariff_fields": {
      "currency": "Australian pound (£)",
      "hist1930": null,
      "hist1945": null,
      "pre_m_add": null,
      "pre_m_adv": null,
      "pre_m_both": null,
      "pre_m_max_adv": null,
      "pre_m_prim": 0.1,
      "pre_m_spec": 9.9375,
      "pre_p_adv": null,
      "pre_p_both": null,
      "pre_p_prim": 0.05,
      "pre_p_spec": 3.75,
      "pro_m_add": null,
      "pro_m_adv": null,
      "pro_m_bind": null,
      "pro_m_both": null,
      "pro_m_max_adv": null,
      "pro_m_prim": 0.05,
      "pro_m_spec": 9.9375,
      "pro_p_adv": null,
      "pro_p_both": null,
      "pro_p_prim": 0,
      "pro_p_spec": 3.75,
      "product": "Strawpaper, strawboard other than corrugated, and boards n.e.i., of which the f.o.b. price per ton is, or is the equivalent of, in Australian currency, more than £21.5.0",
      "supplier": null,
      "tariff_item": "334(Q)(3)",
      "unit": "per ton"
    },
    "remark": "Observed base-date rates (15 October 1946): M.F.N. £9.18.9 per ton plus 10% primage; B.P.T. £3.15.0 per ton plus 5% primage. Finland's request is 'Reduction in primage'. Australia's response is M.F.N. 'Reduction in primage 5%' and B.P.T. 'Exempt'. Exact £.s.d conversions are £9.18.9 = 9.9375 pounds and £3.15.0 = 3.75 pounds. Because the operative response changes only primage, the proposed specific components are derived as unchanged carry-forwards from the base vector; they are not newly restated rates. B.P.T. 'Exempt' applies to primage and is encoded as zero. No binding is stated. The page also notes a value-for-duty basis change effective 15 November 1947; this row contains no ad valorem scalar.",
    "saved_evidence": {
      "PreRate": {
        "alternatives": [],
        "bbox": [
          0.376,
          0.352,
          0.495,
          0.414
        ],
        "confidence": 0.99,
        "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
        "quote": "M.F.N. £9.18.9, 10%; B.P.T. £3.15.0, 5%",
        "rationale": "Observed in the focal page's base-date columns (distance 0). The specific and primage components are separately allocable. Exact conversion gives 9.9375 and 3.75 pounds; the percentages become 0.10 and 0.05."
      },
      "ProposedRate": {
        "alternatives": [],
        "bbox": [
          0.656,
          0.346,
          0.805,
          0.416
        ],
        "confidence": 0.98,
        "page_id": "sha256:b05f5d689f35f699bb9cf1b080a7c86c51919118e333792ee433b37bd15ca281:4",
        "quote": "M.F.N.: Reduction in primage 5%; B.P.T.: Exempt",
        "rationale": "Observed in the focal response columns (distance 0). The request and response expressly concern primage, and 'Exempt' is vertically aligned with the B.P.T. primage component. Thus proposed primage is 0.05 M.F.N. and zero B.P.T.; the unchanged specific components are derived carry-forwards and are recorded as such in the remark."
      }
    },
    "classification_dispositions": [
      {
        "anonymous_reader": "Reader A",
        "canonical_row_id": "pg_463d2039cbcece989a26#cr0001",
        "disposition": "corrected",
        "group_id": "pg_463d2039cbcece989a26#g0001",
        "source_rationale": "The Tier 1 classification, geometry, product, primage values, and raw B.P.T. rate reading are supported. The source provides allocable specific and primage components, so the specific rates belong in their scalar cells rather than MultipleRates; the omitted base and unchanged proposed specific scalars were restored with exact £.s.d conversion, and MultipleRates was cleared."
      },
      {
        "anonymous_reader": "Reader B",
        "canonical_row_id": "pg_463d2039cbcece989a26#cr0001",
        "disposition": "corrected",
        "group_id": "pg_463d2039cbcece989a26#g0001",
        "source_rationale": "The Tier 1 classification and component-wise carry-forward interpretation are supported, but the fixed tile reads the B.P.T. specific duty as £3.15.0, not £9.15.0. The preferential base and proposed specific scalars were therefore corrected from 9.75 to 3.75 pounds."
      },
      {
        "anonymous_reader": "Reader C",
        "canonical_row_id": "pg_463d2039cbcece989a26#cr0001",
        "disposition": "corrected",
        "group_id": "pg_463d2039cbcece989a26#g0001",
        "source_rationale": "The Tier 1 classification, B.P.T. reading, exact historical conversions, and primage treatment are supported. Because the operative response expressly changes primage only, the pre-existing specific components remain part of the resulting compound rates; proposed M.F.N. and B.P.T. specific scalars were added as documented derived carry-forwards. The degraded-glyph alternatives were resolved from the fixed tile and title."
      }
    ]
  },
  "final_39_column_record": {
    "Currency": "Australian pound (£)",
    "Date": "20.5.49",
    "Hist1930": null,
    "Hist1945": null,
    "MultipleRates": null,
    "Normalized Stage": "Offer",
    "Page": 4,
    "Partner": "Australia–Finland",
    "PreM_AdV": null,
    "PreM_Add": null,
    "PreM_Both": null,
    "PreM_MaxAdV": null,
    "PreM_Prim": 0.1,
    "PreM_Spec": 9.9375,
    "PreP_AdV": null,
    "PreP_Both": null,
    "PreP_Prim": 0.05,
    "PreP_Spec": 3.75,
    "ProM_AdV": null,
    "ProM_Add": null,
    "ProM_Bind": null,
    "ProM_Both": null,
    "ProM_MaxAdV": null,
    "ProM_Prim": 0.05,
    "ProM_Spec": 9.9375,
    "ProP_AdV": null,
    "ProP_Both": null,
    "ProP_Prim": 0,
    "ProP_Spec": 3.75,
    "Product": "Strawpaper, strawboard other than corrugated, and boards n.e.i., of which the f.o.b. price per ton is, or is the equivalent of, in Australian currency, more than £21.5.0",
    "Proposer": "Australia",
    "Remark": "Observed base-date rates (15 October 1946): M.F.N. £9.18.9 per ton plus 10% primage; B.P.T. £3.15.0 per ton plus 5% primage. Finland's request is 'Reduction in primage'. Australia's response is M.F.N. 'Reduction in primage 5%' and B.P.T. 'Exempt'. Exact £.s.d conversions are £9.18.9 = 9.9375 pounds and £3.15.0 = 3.75 pounds. Because the operative response changes only primage, the proposed specific components are derived as unchanged carry-forwards from the base vector; they are not newly restated rates. B.P.T. 'Exempt' applies to primage and is encoded as zero. No binding is stated. The page also notes a value-for-duty basis change effective 15 November 1947; this row contains no ad valorem scalar.",
    "SourceFile": "500083-0004.pdf",
    "Stage": "Response to Finland's request for tariff concessions",
    "Status": "Accepted",
    "Supplier": null,
    "Target": "Finland",
    "TariffItem": "334(Q)(3)",
    "Unit": "per ton"
  },
  "display_notes": [
    "Website explanations summarize saved decisions; they are not verbatim model quotations.",
    "Proposed per-ton duties are documented unchanged carry-forwards, not newly printed figures.",
    "The third reader in this recorded case was Claude; identity is taken from the provenance ledger, not its logical lane name.",
    "The separate 13.4% to 1.5% comparison is not a measured error rate for this example."
  ]
}