awesome watch . . . these are among my favorites, and I will have a couple of additional models, to introduce to our readers, sometime soon. Your movement appears to be very clean.

I believe that the movement is Valjoux 72C . . . a derivative of our favorite Valjoux 72 movement.

Shown below are your movement, and a photo of this same movement, from a triple calendar chronograph produced circa 1946.

Thanks for posting your message.

Jeff