I've identified this stamp as Scott US #634; please feel free to correct me. It appears to be heavy on the ink, and there's the same perf error on top and bottom.
Is this a generic perf error or something special? Opinions welcomed. Thanks for looking!
Broken perforation pins could occur. The rotary press perforator used a drum with horizontal pin rows to perforate horizontal rows combined with a conventional line perforator to perforate vertical rows.
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Posted 05/28/2017 11:24 pm
