Identifying Your Vintage Frog Prince Ring: History & Maker

Question
Have you ever heard of/viewed a 'Frog-Prince' ring - possibly based on the fairy-tale? I have a heavy Sterling Silver ring which forms a frog on the outside band and is carved with a 'prince' on the inside of the band. There is a trademark but it is difficult to describe - looks like two circles in an odd pattern inside a square.  I am interested in finding out something about this ring - who made it? is it part of a fairy-tale set? etc... My mother bought the ring at an antique store before I was born 30+ years ago.  

Answer
Cynthia I have seen one but I dont know much about them including who made them.
Most of what we see submitted for appraisal is of Gold and Platinum.
Sorry I couldn't be of much help.
Perhaps a Silversmith would be your best bet.

Sincerely,
Arthur DeMello GG (GIA)