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Offset Printing

Probably the easiest method to tell an offset printing stamp is by its general appearance. Looking at the two halves of stamp below you can see what I mean, offset stamp has a very clear printing. To be more exact look at the eyebrows on George Washington

Image
Perforation 8½
Perforation 8½
Perf 10
Perf 10
Perf 11
Perf 11
Perf 12
Perf 12
No perfs
No Perfs
Rotary/Flat Press
Rotary/Flat Press
Which type?
Which type?
Bluish paper
Bluish paper
Offset printing
Offset printing
Watermarks
Watermarks
Private Perforations
Private Perfs
Perforations
Perforations
Which 3¢?
Which 3¢?