This type of perforation is private and is called a Schermack. I think in this case it is a type 3. Great article is available on StampSmarter.com for further info. Link is as follows: https://stampsmarter.org/1847usa/PrivatePerfs.html.
In that case it would be a 482. The S written on the back suggests someone previously watermarked it and the S is located where it's written. Wouldn't be the first time a prior owner was wrong but probably worth rechecking.
I just received my order from you yesterday. Thanks
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