I would not try any of that myself. LOL.
Thanks for posting thes additional photos and information. I really appreciate it. I am surprised to learn that it may not have been designed by Genta -- I had thought it was. Is there any confirmation of your friend's theory or information?
A base JLC movement inside? Well, you know, as they say, there's a little JLC in every watch, so it would not surprise me. In the case of your photos, there's sometimes a little JLC behind every watch, too. I really want to find a vintage JLC desk clock of some kind...but I digress.
Well, thanks again. It is really nice to see this model and its siblings. I was not aware of the square model at all.