I had thought that this 'NOS' Cyma wasn’t keeping time and needed to go for a check up but, after winding the hidden crown with a crown-winder, it’s now running fine 😗
Dura-Ace levers and Weinmann centre-pulls? Cotter-pinned bottom bracket? I had a bike built like that once. On it's 4th frame, 3rd set of wheels (front anyway due to crashes), everything on it had been replaced at least once in 8 years of ownership in my teenage years. My friends called it "the tatting special". Tatting being a local word for scrounging and light thieving.
Edit: I should also admit that of my current bikes there is only one that hasn't been hacked in some way, a couple in particular being major doners of parts to other bikes.