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Tks finding these in this condition is v hard. Your wise words are helpful. I heard the US waterproof cases were not quite as good as the Swiss, but suspect often such issues might be servicing and activity.
In U.K. Import taxes often make these uneconomic from Europe. U.K. prices reflect this and 14 and 18ct harder to find at sensible money. This looked ok. I won’t leap at it!
There is no reason to avoid a US Collection watch. The cases were made by top case-makers and the only issue, if you could call it that, is that the straps are in inches, not millimeters, but you can get NOS straps and bracelets on eBay.
Leap away, you have nothing to fear.