Uruguay Scott C97

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.

View The Hint

The genuine perf is 12½ and the vertical line in the stake-shaped device in the lower right corner is close to but clear of the outer frame line of valve tablet. The forgery perf is 11½

Check Your Answer

B is the genuine stamp

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Scott Catalogue numbers reprinted with permission from Amos Media Company. All Rights Reserved.

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