So do you have a picture of the other 19 coins. How about 15, or 10, or even 5. I suppose this must be your last one. I have never seen these coins in a picture with more than one. Whether the total is 10 or 20 or even 40. Its a super rare coin. Im going with the encyclopedia until I see some proof of some quantities of these BF coins. Because up until now their few and far between.
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There's no doubt these are rare coins and even rarer at the quality of yours with CoA etc. Unfortunately no one but smoothie really knows how many were made, but I can tell you I had 20 at one point, so there's more than that.
If anything I'd be sus of funded "buyer funded" coins. It's relatively easy to laser etch "buyer funded" into the hologram of a funded black text coin.
Congrats on the sale anyway, you got a very nice premium and this is hopefully the first of many crypto coins at auction houses like this.