Rolex registered design 6694 uses the Cyclops 108 crystal, The movement 1225 uses mainspring 770/146. Bestfit also makes the generic. This is the same mainspring that is used for the 1220 movement.

The 1225 movement is a manual wind movement and does not self wind.

The bezel that fits over the crystal is different from most plain bezels. This design has a bezel that is cut out on the bottom inside of the bezel. This allows the bezel to fit over the raised portion of the watch case.

The bezels measure the same on the ID and OD and the thickness is the same.