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There were seven eras for the postcard industry and each one has distinguishing points to help establish its respective identity.The following helps determine the era of the card in question.
The rate of postage for postcards has changed throughout time and can be used to find an approximate date for postcards.
Postcard producers printed cards that followed the current trends of postcards.
Dates can be approximated by the material and design of a postcard.
The Pioneer Era began when picture postcards were placed on sale by vendors and exhibitors at the Colombian Exposition in Chicago, May 1893.
These were very popular and proved to be a great success.