Welcome.
This stamp was one of the workhorses of the era with literally billions of them printed. There are indeed a few rare varieties but the odds of finding one is less than winning a mega-lottery. As such, always start an identification process with the assumption that you have the most common varieties (to avoid any conformation bias).

If you would like to learn more this page is a good place to start
http://stampsmarter.com/1847usa/1922Identifier.html
Don

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