Hmm. I've never seen a hallmark like that.
Was this given to you or did you buy it?
Have you tried taking it to a jeweler? That would probably be my next step. They can look at the whole piece and the hallmark.
You could also try the library. I'm sure there are many books with all the hallmarks available. A bit of work for sure, but worth it if you really want to know.
Just to guess I'd say it's sterling silver, but the hallmark itself, I have no idea.
Sorry, I wish I could be more help.
I'll try searching. If I find anything I'll post it here.
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