Vintage Heart Within a Heart "Carmen" Sweetheart Bracelet

This is a pretty little bracelet, small in size either for a child or someone with a very small wrist.  The heart within the heart could probably be engraved with an initial if you wished, or left the way it is.  It measures approximately 1 1/2" across x 3/8" high; the heart is about 5/8" high x 3/4" across at the widest part.  It will expand to about 3 1/4" and the expansion is nice & tight.  The inside of the band is marked "Made In U.S.A.; Carmen"; and what looks like "3X0730".  Most of these type bracelets are gold filled and this one looks like it is; however, it is not marked.  Any dark areas are from my photo setup and not on the bracelet.  It is in very good condition other than a few very small light scratches.  They were called "Sweetheart bracelets" as they were popular during the war and usually given as a gift from a soldier to his sweetheart.  Most of these bracelets are circa 1940's.  Information I found is that "Carmen" was made by the D. F. Briggs Company.