Here is my prototype coin or artists proof from Max. It was a gift from Max and I don't know if he made others. I think it was a prototype for the gold\silver issue he did but I'm not 100% sure. The frame is a lighter metal than the polished steel that came with those. The serial is "AP7". There are no crypto keys.
https://i.imgur.com/KZ5hVMB.jpghttps://i.imgur.com/YuasQ63.jpgI'll try and do some better pictures in the near future.
Thanks so much for posting this, I've been trying to find images of these for a while. My understanding is that there were 12 made, Kialara posted this in a thread here somewhere.
From what I can see the differences between this and the final Gold bars is:
Different matte, and less rounded "Frame" on the outside
No Kialara engraving on the top or bottom, front or back.
Internal screw heads haven't been drilled out
The hologram on the front is 0.1 BTC whereas the final Gold bars is 1 BTC