Zeiss ZM 21/2.8 Biogon in excellent/mint- condition. The glass is mint and I really don't see any wear on the body. I only used this lens a short time on a M8, due to to the need to pay new expenses. It is a great lens.
Anyway, I had gotten as far as etching the outlines of the 6-bit coding on the flange as shown in the last photo. I have not done any dremeling or grinding.
New price $825, shipped in US, and Paypaled.