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Open Question: I can’t figure out my Sterling silver jewelry mark!?

I have a ring that was passed from my mother, to my sister, to me. I know it's probably not real sterling silver but it is precious to me and was hoping to track down some information on it. Its marked:

STERLING ->U<-

(the arrows are suppose to be short same length lines with the outer "V' and same length inside center line)

I've looked on websites with Sterling Silver markings but have not found one resembling this. Any help would be grateful! Thanks