Dating postcard stamp boxes
These cards were all issued with the inscription "Private Mailing Card," and today they are referred to as PMC's.It is easy to identify these because of the inscription.This prevented the face of the card from being written on and proved to be a great boon for collectors.Normally the view colors or images filled the entire card with no white border.All cards during this era had undivided backs of privately printed cards.All cards during this era had undivided backs and only the address was to appear on the back.4 Triangles pointing up (corners) helps you date the card which is from 1904 to 1918.
The Pioneer Era began when picture postcards were placed on sale by vendors and exhibitors at the Colombian Exposition in Chicago, May 1893.
I got this information from Real Photo Postcards Kwik Guide by Gary W.
Research has already been done by earlier historians and guidelines have been put into place.
You had to have the words Post Card printed on message side, no specific rule on style of lettering or size so you do see some interesting letters.
Also required were the words Correspondence Here and Address Here. I have observed in this postcard 3 ladies dressed quite nicely but the man appears to be wearing an apron. Maybe it is a family outing and the brother is doing the cooking.