Hopefully you can notice the significant moisture on the inside of the plexi. The problem is of course that the metal on the inside can rust/seize if not taken care of. So, time to tear it down for cleaning!
I've made another video, this is quite a bit shorter than the Seiko 6309a and Molnija 3602 vids, owing to the fact that its a disassembly and not an assembly. Enjoy!