The 1933 Peace of 1783 Issue
(read how to value your stamp below)
You have the peace of 1783 issue from the year 1933. This issue is very common.
There are two varities, the single issue can is Scotts number 727 and its value can be found by clicking here.
The other variety has a gutter block in between the stamps, either horizontally or vertically, this is Scotts number 752 and its value can be found by clicking here.