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Earlier cards were called ‘Private Mailing Cards.’ Only the address was allowed to be written on the back of the card during Post Card Era. Divided Back Era ( ) Postcards with a divided back began March 1 1907.The address was to be written on the right side and the left side was for writing messages. The early images were ‘full bleed,’ meaning that they went all the way to the edge of the card. 1910 — 1924 AZO (Squares in each corner)  1925 — 1940s AZO (4 triangles pointing upward)  1904 — 1918 AZO (2 triangles up, 2 triangles down)  1918-1930 AZO (diamonds in corners)  1907 — 1909 AZO (nothing in corners)  1922 — 1926 Other tips between for telling the difference between vintage and modern reprints As old postcards can easily be reprinted on home computer printers these days, the following are some additional tips for telling the difference between vintage and modern reprint.

These indentifying marks on the back are normally found stampbox corner.

They identify the manufacturer of the photographic paper.

Reprinted by Beijing's Three Shadows Art Center, his guides "Judging the Authenticity of Prints by the Masters" and "Judging the Authenticity of Photographs" were the first comprehensive books on the subjects published in China.

* British and Canadian cards ** Incomplete chronological assessment # Some sources say 1926.

* Early real photo postcards are on thinner stock have matte backs, though the fronts can be glossy.

If the back has a smooth, plastic surface, it’s modern.The key is silvering is an aging process and appears after decades.The presence of silvering is strong evidence of a real photo postcards old age.* A previous column showed how to identify modern paper and fakes with a black light. David Cycleback is an art and artifacts historian and an internationally known authentication expert.He has authenticated artifacts for major institutions, was a writer for the standard academic reference Encyclopedia of Nineteenth Century Photography, and teaches courses in art authentication.Kodak introduce plastic resin-coated paper in 1968.