Vintage 1930s duette rhinestone brooch Wilhelm Goetz Patent 2045385

The brooch has two patent numbers on it- pat 2066969 which relates to the safety catch and bar pin clasp (patent by F.E. Farnham- 1937) and also pat 2045385 which is a 1936 Wilhelm Goetz patent- he was Assignor to C. and G. Manufacturing co., Inc of Providence RI, Chusmir & Goldenberh Mgf. Co. Other than the two patent numbers, this is unsigned. 

I've priced this fairly for a piece with no specific signature. The stones are all in place, it's a really lovely example! One thing to note, I could not get the clips off the base brooch, I didn't want to force it! 

It measures 7cm wide 

I will combine on postage.