I'm finding it difficult to identify this 3¢ Washington Vending Machine perforated stamp on cover, I have some idea but want to make sure - need help with this
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"Experience is the name you give to the mistakes you made yesterday."
re: Shermack 3 - 3¢ Washington Vending Machine Perf.
It's a Schermack Type III perforation.
If you're asking about the stamp itself, it could be Scott #535 (Type IV).
A bit hard to tell from the scan. The top line of the toga rope is strong, and it looks like the "P" and "O" of POSTAGE are joined. I can't discern the lines in the toga button, though.