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Wrist cheese is the colloquial term used here mostly,,,verdigris the somewhat nicer expression ...
Well, what’s “normal”... it’s not unheard of, just to an extent here that I’d assume the watch has never been cleaned. It might tell you something about the rest of it’s condition and I’m sure it hasn’t seen a watchmaker in quite a while, but if you like the watch itself and it’s technically fine / the price is such that repairs are in the budget than this shouldn’t necessarily put you off.
I’ve acquired a Genève that I had been looking for for a while (purple dial, orange second hand) the other day that looked similar. After a proper clean a beautiful watch revealed itself. Sometimes, this kind of wrist cheese means there’s a bargain to be picked up. Sometimes.
Not always superficial. I've found sometimes that moisture trapped between the cheese and steel can create pitting in the steel and for me. Means the case is garbage.
Majority of the time I avoid them unless others also do and I could get it cheap for the movement (if case is bad)
Haven't bought any watches in a good number of years though since my watchmakers passed away
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It probably is wrist cheese - but there is also a distinct possibility that it is corroded. Despite our faith in stainless steel, the SS that was used when that watch was built is quite capable of rusting. I have seen some very presentable watches (on the face side) that have had deep corrosion around and under the back.
In the case of your watch I would want to see a pic with the back off.