1¢ Washington Head
Perf 12

There is no need to check the watermark on this stamp, it is single-line watermarked and printed by the flat plate method. If the one cent Washington is perf 12, the Number is 405. This stamp is common, even in never hinged condition, although better centered copies bring a premium.

Perforation Method of Printing Watermark Number
12 Flat Plate single-line 405

Washington Franklin Identifier Tool