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From 1908 until 1913 production dates are not clear and were determined by copyright dates found on a few of the cards. After 1913, dates began to appear occasionally in the order books kept by the company and from 1922 on, production dates were well documented.
Early real photo postcards are small by their very nature and since most were contact printed, not enlarged, there is no visible texture.In printed images the grey areas are usually made up of black marks that are spaced to create the optical illusion of greys.Though most of us today are familiar with the concept of photo grain, this is mostly because we have experienced very large prints made from small 35mm negatives.Collotypes, which provide the finest detail of all printing methods are sometimes confused with real photo postcards.But even collotypes will exhibit a discernible grain when magnified.
Thus the next card printed after 2934-30 was 0A2935.