Does anyone know the actual name of the movement that is found in most of the 21J SMP 300m watches? I just got one from another member, and it is off by 1 1/2 min per 8 hours. Tried regulating and the movement wouldn't work anymore until I returned it to the original location. So I think the movement is toast. I'd like to by another cheap 21j movement, but not sure exactly which one to get, and where to get it. Any ideas? I'll post this in the movement section also.
