Here is an interesting piece together of a couple old posts/quotes. Hopefully I'm interpreting these right as I don't collect postcards
1-The dividing line on Postcards started on March 1, 1907.
2-For a short time after that, postcards still had white space on front for writing purposes, basically printers using up what they had to save on money
3-If yours has the white space on front and the divide line, then it was probably made shortly after March 1st
The first two are facts, the third is an assumption based on those facts
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