(read how to identify your stamp below)
You have the 1¢ Franklin from the years 1870-1879. It is quite common.
If the stamp has an embossed grill (shown below), then click here.
If the stamp has no grill then examine the large number one on the bottom of the stamp.
A crescent in the pearl or dot to the left of the number one (shown below) identifies the 1873 issue, it is #156 and can be found by clicking here. If it does not have thie crescent to identify the stamp you will have to examine the shaded area above Franklins head.
If you see the shading above the head is the same consistency as the rest of the shading around the head (shown below) AND the color tends to be more blue (the left stamp shown at the top of this page) it can be either one of two issues. Those with a cancel showing a date after February 4th 1879 click here, otherwise click here.
An example of normal shading
If you see the shading above the head being almost solid (shown below) AND the color tends to be more of a greyish blue (the right stamp shown at the top of this page) click here
This stamp was reprinted in 1875 and it can be viewed by clicking here. These are all accounted for, and will have been identified by an accompanying certificate.