{
    "type": "product",
    "name": "Lancaster International Patent",
    "url": "https://www.cameraworth.com/l/lancaster/international-patent/",
    "brand": {
        "name": "Lancaster",
        "url": "https://www.cameraworth.com/l/lancaster/"
    },
    "answer": "The Lancaster International Patent sells for about £130 (median of only 3 recorded sales, 2001–2017; indicative, old).",
    "figure": {
        "grade": "indicative",
        "grade_label": "Indicative",
        "modifiers": [
            "old"
        ],
        "n": 3,
        "median_gbp": 130,
        "middle_half_gbp": null,
        "period": [
            "2001-03-20",
            "2017-10-20"
        ],
        "last_3_years": null,
        "pools": null,
        "one_sale_moves_this": {
            "without_lowest": 135,
            "without_flagged": null,
            "without_highest": 115
        },
        "extras": {
            "median_usd": 172,
            "median_eur": 147,
            "note": "USD and EUR from each sale converted at its month’s ECB rate"
        },
        "basis": "Auction hammer prices with the buyer’s premium removed; eBay as sold"
    },
    "reason": null,
    "versions": [],
    "set_apart": [],
    "version_status": null,
    "book_guide": null,
    "sales_shown": [
        {
            "id": 4940,
            "date": "2017-10-20",
            "venue": "Flints Auctions",
            "title": "A J. Lancaster & Son 'The International' Patent Quarter Plate Mahogany Tailboard Camera",
            "price": 156,
            "currency": "GBP",
            "gbp": 130,
            "basis": "premium_inclusive",
            "version": null,
            "version_status": null,
            "in_typical_price": true,
            "set_apart": null,
            "flags": [],
            "source_url": null,
            "lot": "238"
        },
        {
            "id": 39862,
            "date": "2003-03-11",
            "venue": "Christie's",
            "title": "International patent tailboard camera",
            "price": 117,
            "currency": "GBP",
            "gbp": 100,
            "basis": "premium_inclusive",
            "version": null,
            "version_status": null,
            "in_typical_price": true,
            "set_apart": null,
            "flags": [],
            "source_url": "https://www.christies.com/en/lot/lot-4063042?ldp_breadcrumb=back",
            "lot": "328"
        },
        {
            "id": 9759,
            "date": "2001-03-20",
            "venue": "Christie's",
            "title": "International patent tailboard camera",
            "price": 164,
            "currency": "GBP",
            "gbp": 140,
            "basis": "premium_inclusive",
            "version": null,
            "version_status": null,
            "in_typical_price": true,
            "set_apart": null,
            "flags": [],
            "source_url": "https://www.christies.com/en/lot/lot-2008010?ldp_breadcrumb=back",
            "lot": "241"
        }
    ],
    "sales_ledger": "https://www.cameraworth.com/l/lancaster/international-patent/sales/",
    "citation": "“Lancaster International Patent: about £130, the median of 3 recorded sales, 2001–2017 (Indicative, method v1).” cameraworth.com, retrieved 8 October 2026. https://www.cameraworth.com/l/lancaster/international-patent/",
    "method": {
        "version": 1,
        "url": "https://www.cameraworth.com/methodology/"
    },
    "computed_at": "2026-10-08 00:10:00.968880",
    "attribution": "Data from cameraworth.com — a public register of what cameras and lenses actually sold for. Cite the page URL and the retrieval date; see /methodology/ for how each figure is made."
}