I am a sedentary septuagenarian and I'm confused. I have a new watch -- an Alpha with an unknown (by me) self-winding mechanical movement. It does hack. I set it with the Colorado cesium clock at 17:58 Saturday. It was spot on at that time. Sunday at the same time the watch had lost 3 seconds. When I checked it today I expected it to be 6 or 7 seconds slow. Not so. It was 3 seconds ahead of the Colorado clock. It had gained 6 seconds in 24 hours. Anyone know why? As I said, I am sedentary; I did not play basketball or pitch a game during that time. Heck, I did'nt pitch anything else!
Is it possible that one of the rubber bands in the movement broke?