Anyone able to identify these? The one with the "Chinese Mail" baffles me. I can find overprints for "China" in the Scott Catalog but not "Chinese Mail". The other one with "DP" is a mystery to me also. Thanks in advance!
Being a commercial opt, and early one at that, Perhaps the opt was not letterpress, and merely a rubber / steel handstamp struck individually, and with several hammers of varying designs?
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