51StudebakerDialysis, damned if you do...dead if you don't
20 Nov 2018
04:06:53am
re: A Little Help With Identification.
#554d is perf 11 x 10 (top or bottom), your stamp is perf 10x10, #583. The perfs are the same for the sides and the top/bottom. Image below shows the perfs from the right side of your pair digitally compared to the top/bottom perfs. As you can see, they are the same so it cannot be a #554d.
http://stampsmarter.com/1847usa/1922Identifier.html
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