Looks like the hand written cancel is from 1875. So does this mean it must be either the a or c color variety? If so, it seems there is no value for a used c from 1875. Any ideas on what this maybe worth?
hello from that image it's hard to tell the color, but it's most likely a 37a. For both stamps (a and c) there is a value given for used stamps in Michel, 50 and 300 EUR. Here you can compare perhaps a bit your color: https://www.philasearch.com/de/tree...t=CO-1100040
(although those scans aren't color-proof all as well)
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