(read how to identify your stamp below)
You have the 30¢ Alexander Hamilton from the years 1870-1879. It is fairly uncommon.
If the stamp has an embossed grill (an example is shown below), then click here.
Example of a grill
If the stamp does not have a grill embossed on it (shown above) and it
has a cancel with a date later than February 4th 1879 click here otherwise click here.
This stamp was reprinted in 1875 and it can be viewed by clicking here.
These are all accounted for, and will be accompanied by a certificate