Here is a link to the movement datasheet for the Minute Machine and Double Tap. It was great guidance when changing the batteries. startech – Caliber 5021.D

The movement for the Minute Machine is actually a RONDA 5040.B I believe.Here is a link to the movement datasheet for the Minute Machine and Double Tap. It was great guidance when changing the batteries. startech – Caliber 5021.D