Mechanical watches need to be serviced every 4-6 years. After this time the lubricants have dried up, and the residue acts as an abrasive. Dirt will increase this action, but your watch is probably not going to have dirt because of the design of the case.
Before I went to watchmaking school, I bought a NOS dive watch at the flea market at Jarvis and King, and proudly wore it daily until it destroyed itself. It took three months. The watch was from the early 60's, and had never been serviced. When I got to watchmaking school, we discovered the extent of the damage. The pinion of the centre wheel had torn loose, there was ruby dust from the abrasion of the dried up lubricant, and the watch was impossible to wind. Fortunately we had parts for the movt and I restored it after the first year of school. It was a valuable lesson.
This is a beautiful watch, Beau Brummel, and the variant for yellow Gold is probably a different designation, but maybe not.
Beau Brummell "DDDW" according to a 1961 price guide. Yellow gold version.
Agree - Beau Brummel DDDW.
Another example of how Case Colour affects a Model variant designation, reguardless of how the vintage advertisements read.
So are we identifying my watch as 05735 Y Beau Brummell "DDDW"? Where can I see this example? Or is this it? Are we back to 2 LL's & not one. I have a jeweler near me that is going to open,clean, & oil it in the new year, anything in particular we should look for?