{
  "title": "Treaty No. 6 medal, 1876 — photographic 3D reconstruction",
  "status": "publication authorized for wolfwhale.ca by owner on 2026-09-30",
  "specimen": {
    "description": "Silver Treaty No. 6 medal dated 1876, photographed for Geoffrey Bell Auctions' Toronto Coin Expo Spring Sale 2022, lot 135 / iCollector 44335064.",
    "maker": "J.S. & A.B. Wyon",
    "diameterMm": 76.4,
    "edge": "plain",
    "suspension": "Original clasp and hanger at 12 o'clock, as catalogued by the auctioneer.",
    "source": "https://www.icollector.com/Lr-1191-Indian-Peace-Medal-Treaty-No-6-1876-Silver_i44335064"
  },
  "method": {
    "units": "metres",
    "faces": "Unaltered source JPEGs mapped onto circular meshes with ellipse UV bounds; lettering, design and tarnish come from the original photographs.",
    "geometry": "Constructed disc, bevel and suspension. The face relief is visible in the photograph, not measured or sculpted into the mesh. No invented luminance-to-height conversion.",
    "nominalThicknessMm": 4,
    "thicknessStatus": "Visual modelling assumption, not a measurement of this Treaty 6 specimen.",
    "suspensionStatus": "Silhouette-informed reconstruction; depth and joint mechanics unmeasured.",
    "accuracyLimit": "Not a photogrammetry or laser scan, not dimensionally certified, and not suitable as an exact relief reproduction or manufacturing master. A calibrated multi-view scan of the physical specimen is required for those uses."
  },
  "rights": {
    "photographyCredit": "Geoffrey Bell Auctions, via iCollector",
    "licence": "Website publication permission confirmed by owner; no open reuse licence established.",
    "publicationStatus": "Owner confirmed permission to publish these two photographs on wolfwhale.ca on 2026-09-30. No general third-party reuse licence is granted by this model.",
    "historicDesign": "The age of the medal does not establish a reuse licence for the modern photographs.",
    "permissionEvidence": "Direct owner answer yes to: Do you have permission to publish those two photos on wolfwhale.ca?"
  },
  "assets": [
    {
      "file": "obverse.jpg",
      "face": "Queen Victoria; VICTORIA REGINA",
      "source": "https://dygtyjqp7pi0m.cloudfront.net/i/53963/44335064_1.jpg?v=8DA29711F63E470",
      "width": 1417,
      "height": 1800,
      "sha256": "514cc55693a7cc017e236bd84351bf4426681036ddaae2b60895ee2d57c57760",
      "ellipseUvGuide": {
        "cx": 706,
        "cy": 1073,
        "rx": 671,
        "ry": 701
      },
      "uvGuideStatus": "Approximate visual measurements by eyes agent; photographs have perspective distortion."
    },
    {
      "file": "reverse.jpg",
      "face": "Handshake scene; INDIAN TREATY No. 6; 1876",
      "source": "https://dygtyjqp7pi0m.cloudfront.net/i/53963/44335064_2.jpg?v=8DA29711F63E470",
      "width": 1421,
      "height": 1800,
      "sha256": "a2608b613964290ef58878bf081a905518f0dbdd768609b99633f40580471ed3",
      "ellipseUvGuide": {
        "cx": 711,
        "cy": 1055,
        "rx": 686,
        "ry": 700
      },
      "uvGuideStatus": "Approximate visual measurements by eyes agent; photographs have perspective distortion."
    }
  ],
  "crossChecks": [
    {
      "source": "https://www.michelfirstnation.com/photos-of-treaty-6-medal.html",
      "use": "Museum-supplied photographs of a different historical Treaty 6 medal; visual cross-check only, not mixed into this specimen's textures."
    },
    {
      "source": "https://www.historymuseum.ca/teachers-zone/history-box/colonial-canada/unstamped-treaty-medal/",
      "use": "Shared Numbered Treaty design and distinction between stamped number/date and unstamped medals."
    }
  ],
  "dependencies": {
    "threeRevision": "180",
    "exporterSource": "https://raw.githubusercontent.com/mrdoob/three.js/r180/examples/jsm/exporters/GLTFExporter.js",
    "exporterModification": "Bare three import changed to the existing self-hosted r180 module. MIT licence preserved alongside exporter."
  },
  "researchedOn": "2026-09-30 America/Vancouver"
}