This is a wonderful Longines Advocate watch. It’s in a very good condition apart from a scratch on the dial. It looks like somebody slipped while trying to lift the hands. It’s a real shame but it happens, though I wouldn’t want it to happen with any of my watches. Or even worse, on a watch I’m working on that isn’t mine.
The serial number dates this watch to 1953. If you’d like to date your own Longines, you can try this Longines Year Identifier.
The movement is the Longines 9LT. It’s a movement with an indirect subsecond. I’ll come back to what that means later. This particular one is a 25.17ABC with a monometallic balance. There’s not much to find about this movement, except for the standard info.
This Longines Art Deco needed a service. The power reserve was way down from what it used to be and it sometimes suddenly stopped.