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The green on the dial is possibly a verdigris type reaction from copper in the dial, I would imagine. I have seen it before and a skilled watchmaker managed to remove the green colouration by carefully rinsing with (iirc) a weak acidic solution and then plenty of careful rinsing with water. Perilous task I would imagine.
Can't stop myself posting this other gem from his inventory
https://oliverandclarke.com/vintagewatches/omega-constellation
Case Condition: Extremely good, unpolished, with no significant nicks or scratches
I mean cmon, really? REALLY? Customers are not blind?!