Decoding Earring Markings: What Does 'C765' Mean?

Question
I bought a pair of earrings at a garage sale inside they say c765.Can you tell me what this means?

Answer
Dear Debbie,

I'm sorry, this marking is not familiar to me. I even tried to "Google" it and came up with nothing (and that's unusual these days!). Could you please send me a better description of your jewelry and, preferably, a digital photo? I'd be happy to take a look and perhaps shed some light.

Rich