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time_watcher said:
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?
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 :)
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