One on the left is perf 11. One on the right is perf 10. Is the left stamp regular blue? The right stamp looks like a darker blue to me. Maybe the left stamp is a little faded?
The stamp in the first post is a perf 10, a 586 as stated above. You are looking at the catalog listing for the error type of the perf 11, 557c which is perf 11 on three sides and perf 10 on the other. What you have pictured is NOT that stamp, and dark blue or deep blue really doesn't matter significantly for a 586.
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Posted 09/14/2014 8:00 pm
