You have the 2c Jackson from the years 1870-1873. It is quite common.

If the color of your stamp is closest to the brown of the stamp on the right, click on the numbers 156-166 on the menu to the left, to ascertain its value.

If the color of your stamp is closest to thered-brown of the stamp on the left you should look for an embossed pattern on the back of the stamp, called a grill, an example is shown below.

If the left stamp has a grill embossed on the stamp (shown below), click on the numbers 134-144 on the menu to the left.

If the left stamp has no grill embossed on the stamp (shown below), click on the numbers 145-155 on the menu to the left..

Example of a grill

This stamp was reprinted in 1875 and it can be viewed by clicking on the numbers 167-177. These are all accounted for, so you will not own this.