This is cool. I know nothing about stamps.
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There is always a way to learn my friend.
A few years back..an auction of only inverted center stamps came on the market. Probably the finest i have ever seen. This collection was unique in its quantity and rarity. Take a look and you will understand what people are willing to pay for a small piece of paper. https://stampauctionnetwork.com/f/f114.cfm
https://stampauctionnetwork.com/f/f11412.cfm#46