We are pleased to offer a wonderful vintage piece of jewelry from Coro. This is the sterling silver frog jelly belly duette brooch. This piece was purchased from the estate of a long time jewelry store owner. It is complete and in very, very good condition.
The pin features a pair of frogs with lucite jelly belly bodies, set with tiny clear rhinestones. (Please note the jelly bellies look dark in some of the photos but are not. They are perfectly clear!) The legs, heads, and body frames are sterling silver and have a rose gold wash. The upper part of the legs and the nose are also set with clear rhinestones. The duette clip is also sterling silver with the same gold wash. The eyes of the frogs are golden yellow with black pupils and are either glass or lucite.
There are several marks on the brooch including "Coro Duette" in script, "STERLING", and "PAT. No. 1798867" on the clip mechanism. The frogs are both marked "STERLING" on their individual clip prongs. One front foot of each frog is marked: "STERLING" and one back foot of each frog is marked: "Coro".
The brooch has a rollover clasp which opens and closes properly. The pin does not appear to us to be sterling and has a very slight bend. There are no missing rhinestones and everything appears original to the piece. We have not polished or cleaned or taken the brooch apart and it is being presented just the way we found it.
This wonderful duette brooch was designed by Adolph Katz, the well-known designer of many Coro pieces. The patent design was filed on July 19, 1944 as a "Separable Brooch". Katz was Coro’s head designer, and his career spanned nearly 40 years. According to patent records he appears to have been remarkably talented and a prolific designer, holding more jewelry design patents in his name than anyone else in the industry.