Seamaster 600 153.011

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Hi 😊 Hope you're all doing well.

After spending a bit (a lot 😇) of time browsing Chrono24 recently, I've been trying to get a feel for what to look for when comparing different vintage Omega listings.

I like the Seamaster 600 153.011 & found two, very similar listings (at least in my view). Similar pricing, the same model, etc.

Both are from well-respected professional sellers - so if we put aside things like authenticity - that might be questionable in some circumstances.

What are the things here that one would look for?

https://www.chrono24.fr/omega/omega-seamaster-600--id45863259.htm

https://www.chrono24.fr/omega/seamaster-600-ref-135011-from-1966--id44920344.htm

I hear about dial originality being important. But how do you really know?
The quality of polishing & avoiding over-polishing. Is less polishing & more scratches better?
The level of servicing done in the movement. Can something be "over-serviced"? With vintage watches is ever a case of: if it's not broken don't fix it?

If we take these two listings as examples ☝️ - what does a more trained-eye see here when comparing these - that someone like me does not?
 
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Many of your questions answered here read carefully
 
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Post pictures, not links please. The provided link above is a great read. And yes to scratches. Polishing removes sharp edges and is a big nono.