The article cited by Peter deals with the rotary press rarities of the Washington-Franklin issue. General identification of your stamp can be approached with this tool:
Thank you all, would you know which 498 it may be based on the image? (498a/b.c.d.e.f.g etc?) using http://www.usphila.com scott catalogue as reference?
I would use a "real" catalogue like Scott, as in the internet catalogues like stampworld not all the varieties are listed. US Phila is just a list of sold rare stamps, I think, so not the best choice to identify a stamp.
Your stamp is 498 as cfrphoto wrote, so without any a b c.
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Posted 04/10/2019 08:09 am
