We can't see the details needed to attribute an 81-S from your images. Even the very best of images can fall short when it comes time to try and attribute one of these. I might suggest a short cut if you really want to know and have it labeled as VAM whatever. The person who performs the service in this link is one of the very best. Your coin would stay in the TPG slab and the VAMseal label added to the reverse side. https://www.varslab.com/vamseal.html
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