24¢ Winfield Scott
(read how to identify your stamp below)
You have the 24¢ Winfield Scott from the years 1870-1876. It is uncommon.
The stamp was issued with a grill (as shown below) embossed on the stamp, it is rare and can be found by clicking here
It is likely that you have the version without the grill (shown above). For more details 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.