The 1934 Mothers of America Issue
(read how to value your stamp below)
You have the Mothers of America issue from the year 1934. The stamp is common.
The perforated varieties (Scotts #'s 767 and 768) value can be found by clicking here.
The imperforated variety (Scotts #754) value can be found by clicking here.
The perforated varities are either 11 x 10 ½ perforations or 11 x 11 perforations, there is no difference in the value between the two.