{
  "accessed": "2026-09-24",
  "sources": [
    {
      "id": "S01",
      "title": "Owner website: 912 Targa Blutorange",
      "url": "https://targamarc.com/",
      "kind": "owner-published",
      "note": "Vehicle-specific claims, not independently authenticated."
    },
    {
      "id": "S02",
      "title": "Geburtsurkunde photographed on owner website",
      "url": "https://targamarc.com/media/5857.jpg",
      "kind": "owner-published image of Porsche certificate",
      "note": "Issued 14 January 2016. Gearbox serial is masked."
    },
    {
      "id": "S03",
      "title": "Porsche Classic PET, Kat 073, 911/912 1965-1969",
      "url": "https://files.porsche.com/f/332100/417e8f05d9/kat073-e-911-69-katalog.pdf",
      "kind": "manufacturer",
      "edition": "24 July 2017",
      "pages": {
        "engine_summary": 4,
        "transmission_summary": 5,
        "gear_pairs": 270,
        "differential_1968": 296,
        "targa_exploded_view": 622,
        "roof_frame_chassis_break": 625
      }
    },
    {
      "id": "S04",
      "title": "Porsche roof patent US3476437A",
      "url": "https://patents.google.com/patent/US3476437A/en",
      "pdf": "https://patentimages.storage.googleapis.com/6f/c6/35/2e154c7374e873/US3476437.pdf",
      "kind": "original patent",
      "dates": {
        "priority": "1965-08-11",
        "US_filed": "1966-07-18",
        "US_granted": "1969-11-04"
      }
    },
    {
      "id": "S05",
      "title": "FIA homologation 580: Porsche 912 Targa, Group 3",
      "url": "https://historicdb.fia.com/car/porsche-912-targa",
      "pdf": "https://historicdb.fia.com/sites/default/files/car_attachment/1601037601/homologation_form_number_580_group_3.pdf",
      "kind": "FIA archival scan",
      "note": "12 pages; consultation copy only. Main ratio table is not proof of this car's gearbox build. Scan and website have a one-day date discrepancy."
    },
    {
      "id": "S06",
      "title": "Original range brochure: technical data, W 217 7.67",
      "url": "https://targamarc.com/media/5841.jpg",
      "kind": "owner-published image of manufacturer brochure",
      "note": "Model-level period specification; not a present-day measured result."
    },
    {
      "id": "S07",
      "title": "Owner walk-around image: rear-quarter / Targa roof",
      "url": "https://targamarc.com/media/5868.jpg",
      "kind": "owner-published photograph",
      "note": "Supports a visible flexible rear window, not factory originality."
    },
    {
      "id": "S08",
      "title": "Porsche Newsroom: Targa generations and history",
      "url": "https://newsroom.porsche.com/en_US/products/porsche-911-targa-generations-history-21037.html",
      "kind": "manufacturer history"
    }
  ]
}