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Correct the M is definitely not a hallmark. I thought you would see that when I posted the Miraculous Medal link. What I thought might be a hallmark is STERLING and the Sterling stamp is a huge clue to dating this ring.Here's a closer look at the same (or similar link) that Big Cy posted earlier. It has a little more info on the Virgin Mary image and hallmark, but still nothing specific.
I'm beginning to think the M is for Mary or Miraculous/Medal and not a hallmark.
SBB
The Meaning of the Miraculous Medal | eHow.com
Marian Feasts - November 27
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