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It's common on the Speedmaster since the bezel is friction fit and the gap ends up being a mini gutter for debris, as opposed to a diver with a bezel that allows water & debris to flow through it. It's unlikely to be corrosion. Easy to remove the bezel, clean, then reinstall.
Good to know. In that case can it ever be a positive sign on a vintage speedy? Implying that the watch hasn’t been pulled apart / mucked about with too much if the grease trap is looking relatively untouched?
Well, I'd probably look at that nice beige aged tritium handset and hour markers as opposed to possible poop stains in the bezel to determine condition......
Focus on the right details, it's easy to obsess about small details on these... speaking from experience.
I have a love/hate relationship with my OCD tendencies. Probably saved my ass in a few important cases, but sometimes I have to remind it to chill. It'll pass.
I would also offer that you should be careful if you try and separate that insert from the bezel ring. I know some do it on their own, but I always prefer to let my watchmaker do it.
If you're comfortable doing so, share some more photos of that watch...looks nice from those photos you posted.
There's no need to remove the bezel to get most if not all of that out. I use peg wood, but if you have a toothpick that might work also - use a knife to create a thin wedge shape on the end of the wood, stick that between the case and crystal, and then sweep it around the crystal. It will dig the dirt out very effectively in my experience.
I'd avoid looking too hard, its easy to become obsessed when you play with high end cameras with macro lenses and loupes, you quickly realise that none of your watches, even the brand new ones stand up to scrutiny at a certain magnification.
It’s definitely called wrist cheese and mine came with extra cheese. It does clean up! 😎