Hello
I would like to sell a Coldkey prototype.
I was with yogg when these prototypes were created, testing machines at the very beginning of Coldkey.
I don't remember how many are there, but probably near 10.
Design was made by Polymerbit. This is a cool piece of the Coldkey history 

Starting bid : 0.001 BTC

Minimum bid increments : 0.0001 BTC

End time : Sunday 23th May 2021, 23h UTC+2 (Paris time) - Countdown Timer

Sniping : Bids within 10 minutes before the auction end extend the auction for 10 minutes.

Payment : 3BGiMwTnKmtrafrjNhJi7sDX3z5L5TCM6R

Shipping : $5 worldwide with tracking

Escrow accepted, winner pays fees.