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Posted By: RobertS

Kodak postcard paper has only been around since 1950. Most of the baseball postcards you see were made in the 1970s or 1960s by individual collectors, many to get autographed.

The key to determining a "Real-Photo" card's age is the photographic paper manufacturer. Different brands, such as AZO, CYKO, ARTURA, VELOX and others all feature identifying marks in a card's stampbox, signifying when the paper was issued.

A complete "cheat sheet" and manufacturer stamp box photos are available at this site: http://www.playle.com/postcards.html#realphoto.

Hope this helps...