One of these stamps is a genuine stamp and the other(s) is a forgery. Can you tell the difference? If you are having trouble, see the "hints" and answer below.
On the genuine stamp the crossbar in the “A”s are clearly visible. Engraved, perf 12. On the forgery stamp the “A”s lack the crossbars and it is lithographed. The perf is 12 ½ or 13.