You have the 90c Perry from the years 1870-1882. It is uncommon.

CARMINE STAMPS

You will notice the stamp to the left tends to be more of a carmine color than the stamp on the right. If the stamp does not have an embossed grill (shown below) and errs towards the carmine of the left stamp then click on the numbers 145-155 on the menu to the left.

If the stamps color errs towards the carmine of the stamp on the left and has an embossed grill (an example is shown below) click on the numbers 134-144 on the menu to the left

ROSE-CARMINE STAMPS

If the stamp tends towards the rose-carmine of the stamp on the right then click on the numbers 156-166 or 182-191 on the menu to the left. The latter stamp is printed on a softer porous paper.

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.

The stamps color was changed to purple in 1888. The purple version can be found by clicking the numbers 215-218 on the menu to the left.