I have up for sale this 145.0012 case back that was created by a friend in the USA for a project that unfortunately never got off the ground. Only two were ever made. The centre plate Sigma 7 is complete and looks great. The outside impress needs to be deepened and darkened for full effect. It's a great addition for your FOIS (any Speedy really). Asking USD350 including shipping - prefer payment via Transferwise (lower fees and better exchange rates) but let me know if you have another preference. PM me with any questions.