As some know, Gallet is my brand of choice. I'm currently working on (meaning my watchmaker is working on) a Gallet resurrection project. I have sourced some repair parts to get a MultiChron Pilot back in action. Here's the face:
In working on this project, this question came to mind: When was the Excelsior Park EP4/ EP40 movement no longer used? According to Dr. Ranftt, this caliber was introduced in 1940, with which I agree. When did Gallet/ Girrard Perregaux/ Sinn/ Zenith/ Excelsior Park stop using this?
My MultiChron Pilot here, from my best information, dates to circa 1978. It has the later EP40-68 movement. I can't find any reference later than this for these movements.