As far as I know, there is no glass in the retaining ring, or directly behind the retaining ring. I'm not sure it is even correctly termed a retaining ring, as it doesn't retain anything.
At least there never has been any glass there in mine, and it works perfectly as near as I can tell.
If you take the ring off, you will see a black circular piece about 1 millimeter behind the ring, which has 4 notches in it, presumably there to allow purchase points for a tool, and behind that is the only glass. I don't think that there was ever any glass directly behind the ring which screws onto the front of the body. If there was, it was just clear glass. Not sure there is even any room for glass there, the way this is laid out.
At any rate, I know from personal experience that there is no necessity for any cover glass directly behind the outer ring (which seems to be there only to allow access to the interior).
Just try the camera and see how it works, as is. The 4.5cm f/1.5 S-Coral lens on these things is somewhat exceptional.
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Larry
“It is about time we take photography seriously and treat it as a hobby.” Elliot Erwitt
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