This pressure testing really is problematic. Testing to 10 atm is not really meaningful, this is more like "water resistant".
I do not wish to be the smart ass, but:
The Deutsche Industrienorm DIN 8306 for diving watches says that seals have to hold tight 30 minutes in 1m depth and for 90 seconds in 20m depth. Then they are waterproof according to DIN 8306. However, this depth is just an imaginary figure. If you hit the watch against something, like a slash at the water surface, or sudden movements under water, it might build up a pressure manifold of what has been tested. And then it leaks.
But then you might be lucky, the fakeymariners went down as deep as 50m successfully, IIRC.
Also I have a russian automatic that I had with me on several wreck dives down way over 60m and on long decompression dives.
So it might work - or not, try it out