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.
Saleem,
Here is a good reference for help in determining the private perforation types.
http://www.1847usa.com/PrivatePerfs.htm
Steve
I think Michael is correct, looks like a Shermack 3
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
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.
re: Shermack 3 - 3¢ Washington Vending Machine Perf.
Saleem,
Here is a good reference for help in determining the private perforation types.
http://www.1847usa.com/PrivatePerfs.htm
Steve
re: Shermack 3 - 3¢ Washington Vending Machine Perf.
I think Michael is correct, looks like a Shermack 3