If your early postcard says it was printed in Germany, it is from before The White Border era dates from to The white border was introduced by the U. Postcards from to were printed on a linen texture paper.
Photochrome postcards have been produced from to present. Real photo postcards are actual photographs printed on postcard paper. There may be some indication on the back dating postcard backs the card about the type of photo paper used - this is often indicated by the stamp box, which will be visible if your postcard is unused.
The postage stamp can help you figure out an approximate age of your postcard.
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