(read how to identify your stamp below)
You have the 10¢ Jefferson from the years 1870-1882. It is common.
If the stamp has a grill embossed into the stamp (an example is shown below), then click here.
If the stamp has no grill embossed on the reverse of the stamp then examine the top right corner of the stamp. There is a secret mark, a tiny semi-circle at the end of the top scroll on the right of the stamp. An example of this top scroll with and without this semi-circle secret mark is shown below.
If the stamp does not have a secret mark 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.