My lens have finally been upgraded to be able to be used in M camera with coupling.
https://www.facebook.com/1419474791/posts/10217673708180700/
N°025: Chrome brass 58mm F/1.9 Meyer Gorlitz Primoplan (exakta)
Modification to Leica M mount for Francis Phua, alloy barrel machined like 35 summaron/summicron v1 design. An innovative rangefinder system has been hand-made from brass with fine tune options for digital use.
(Model shown with a rare "M2 S/T Button" dechromed, recoated in polyurethane 2K and sanded to "used" finish)