Great condition 
This specific M3 has just been fully overhauled by Cameraworks UK with the following work carried out -
Camera dismantled. Baffle removed, cleaned, and plush strips re-glued or replaced as necessary. Shutter mechanism dismantled and serviced. Main drum, spring take-up rollers, guides, and bearings cleaned and lubricated. Slow-speed escapement ultrasonically cleaned and lubricated. Cams and shutter curtain release catches cleaned and lubricated. Shutter curtains inspected for light leaks and curling. Curtain slit width and tensions reset. Film transport mechanism cleaned and lubricated. Advance block serviced; forward clutch checked. Advance lever damping adjusted. Frame counter cleaned and lubricated. Speed dial function checked and detent mechanism lubricated. Advance clutch tension adjusted. Rewind mechanism cleaned, lubricated, and checked. Sprocket timing and gear train timing checked and adjusted. Reverse function tested. Brake cleaned and new friction disc fitted. Flash sync contacts cleaned and adjusted. Self-timer mechanism cleaned and lubricated. Shutter release travel adjusted and verified. Frame counter calibrated. Rangefinder blacked out. Main prism replaced as old optics badly dammaged. Rangefinder optics cleaned and serviced, including brightline mask. Rangefinder fully calibrated for infinity distance focus, 1 metre close focus, and minimum coupling distance.
Parallax function checked. Frameline selection operation tested (50mm, 90mm, 135mm). Preview lever adjusted and tested. Vulcanite checked - OK. Film door operation checked. Bottom plate catch lubricated and adjusted. Final optical and mechanical checks completed prior to reassembly.
Camera reassembled, cleaned, and fully tested.
The rangefinder has been replaced and is exceptionally bright. 
This unique M3 was a transitional model between the double and single stroke. As such, the return on the film advance is non ratcheted differing from a typical M3 single stroke.
All is working perfectly ready for its new user
Included is the M3 and a generic body cap