All cards during this era had undivided backs and only the address was to appear on the back.The message, therefore, had to be written on the front (picture side) of the card.
The following helps determine the era of the card in question.
Now they are very popular with collectors of roadside America, Blacks, Comics, and Advertising.
Views are also becoming more popular as collectors realize that this era too is a part of out history, and these cards help to illustrate the changes in the geographic structure of America.
On December 24, 1901, permission was given for use of the wording "Post Card" to be imprinted on the backs of privately printed cards.
All cards during this era had undivided backs of privately printed cards.
Determining an old postcard’s date of printing, or when it was made, can be a complicated process – especially if the vintage postcard was never mailed.