Please advise on the age of this locket and information on the maker. The makers initials are S.B or S.D can't make it out and don't understand the hallmarks. I have had this locket for over 20 years in the family.
This is a Birmingham hallmark with the date letter "o" for 1913 or possibly "O" for 1938. I favour 1913 because I think that the maker's mark is SB for Stainton Brothers who, I think, were not operating in 1938.