{
  "name": "Back clues for real photo postcards",
  "desc": "Eight dating clues from a real photo postcard, six on the address side and two on the picture side, one per row: what each dates, its window, region, strength and qualifier, with source numbers and links. Windows come only from the 1907 postal rules and the cards on this page; no collector date tables are used.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Flickers & Tintypes",
  "url": "https://flickersandtintypes.com/photo-objects/real-photo-postcards/",
  "from": [
    "Supplement to the Postal Laws and Regulations, 1907, Sec. 418 (pp. 65-67); readings of both sides of the 1905 card and the address side of the 1908 card on Wikimedia Commons"
  ],
  "how": "Compiled by Flickers & Tintypes from the data listed"
}