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The easiest way to distinguish a real photo postcard is to look at it under a magnifying glass; it will show smooth transitions from one tone to another. (Britain had already pioneered this in 1902.) The address was to be written on the right side; the left side was for writing messages.
Many important events and scenes in history are documented only by these cards.
Chrome postcards began to dominate the scene soon after the Union Oil Company placed them in its western service stations in 1939.
By 1960s, the standard size of cards had grown to 4 x 6 inches.
Photochromes are not real photos but rather, printed cards done by a photochrome process.Click here for links for dating rea Postcards with a divided back were permitted in the U. Many millions of cards were published in this era -- it was the golden age of postcards.