Help with mysterious Claddagh Ring?

[Silver Branch]

This ring has always been a mystery to me. About 20 years ago, when I was still in school, it mysteriously showed up in my coat pocket one day when I got out of class. I still know nothing about it other than the obvious - it's a claddagh ring and 14K yellow gold. I'm dying to know more about it. I believe the heart in the center is Obsidian? What do the other hallmark letters indicate? Any information anyone can give me at all would be most appreciated! I'm trying to find out as much as I can. Thank You!






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