The 1934 6¢ National Parks Issue
(read how to value your stamp below)
You have the 4¢ value from the National Parks series from the year 1934. The stamp is common.
There are two varieties, one with and without perforations.
The first stamp is perforated (Scotts #745). Its value can be found by clicking here.
The second stamp has no perforations (Scotts #761). Its value can be found by clicking here.