[time_watcher]

Forgive me if this has been asked/answered before but will a 7S26 movement swap into a 6309-7040 case directly or does it take modifications?
TIA

 

[Pei Der Han]

Forgive me if this has been asked/answered before but will a 7S26 movement swap into a 6309-7040 case directly or does it take modifications?
TIA

It requires modifications. The crown positions, day/date wheel positions and a few other things have to be addressed.

But why would you want to put a lesser movement in the watch? NOS 6309 movements are still available