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some of Sinn watches are filled with Ar gas and have additional moisture capsule.
Yup- moisture got in and condensation caused the droplets which are now damage. Damage like this is very common and not always related to someone swimming or showering with the watch.
When the rear seal and crown seal (and pushers too if it’s a chronograph) start to age they lose their ability to keep the moisture out- it can be sweat from the skin or even ambient humidity. Go from a hot humid day outside into air conditioning and it can happen if the seals are compromised. I don’t wear watches with vintage crowns or aren’t waterproof in the heat of swampy summer.
For those who just have to have that original crown and throw caution to the wind regarding the rock hard/goo like gasket inside- this is your future.

Seaslug... not the best name the marketing department ever came up with.
Lovely watch, wouldn't mind having one but Seaslug?
Do they have a military or "Explorer" styled piece called the Woodlouse?

Omega made a sport watch for racing and for Aqua-sports, but always wondered why they didn’t make watches for fly fishing (Masterbaiter) or bowling (Ballmaster)![]()
We fly fishermen do NOT use bait! "Flymaster" would work though
Seaslug... not the best name the marketing department ever came up with.
Lovely watch, wouldn't mind having one but Seaslug?
Do they have a military or "Explorer" styled piece called the Woodlouse?