Even if a vintage watch is working on seller end, it can be a different story after shipping. I always plan on a service. Do the economics make sense? Not always but it’s a nice feeling to bring an old bird back to life, especially if it still looks good.
The one on the left is in almost unused condition so I’m not sure of the movement. 505, 6651, 431? … but it’s crown protrudes slightly although it’s the only one with a quick date change so it may be intentional.
My repairer checked the two he worked on and said neither had date advance.
Unlike the Omega 565 on which the date advances when you pull the crown out, on this it advances when you push it in … and it’s pretty sensitive
