OK well then hit the gap with a pressure washer…works on seized up fishing reels.
Fix these regularly, and nothing gets a seized part de-gunked better than a bit of water from a pressure washer. Just one of the cheaper Karcher ones should do.
Dynamite
Dynamite
Possibly, but many cases look superficially the same. In fact, off brands often deliberately copied case shapes. You would need to check inside. Most watches that used Jenny cases indicated it on the dial with the words Caribbean, Super Submarino, etc. But there are exceptions.