Your stamp is a Scott catalog #632. Your stamp was one of the workhorses of the era with literally hundreds of millions produced over many years. Due to the long production run, there were a number of running changes made to the stamp perforations over time and these are now assigned different catalog numbers. So while the stamp designs may look the same, there can be small differences. But your stamp is worth only pennies. When looking up stamp value, always assume that you have the most common, not the rarest.
Stamps are as common as rocks, the odds of finding a diamond in a bunch of rocks is virtually zero. Same for stamps.
That said, stamp collecting is a great hobby if you are interested. Don