Mid Century Modernist Abstract Design Metallic Brooch

So evocative of the 1950's designs, an authentic vintage brooch of that time in very good condition, quite substantial in size at 6cms x 5.5cms x 5.5cms.  Fabulous abstract design on copper coloured background. The enamelling is in perfect condition. Obviously hand made with a firm roll over safety clasp to the back.  A recent acquisition from an estate sale in USA with no known provenance and no signature.  Gift boxed by Vintageonline.