An onyx and diamond dress set

An onyx and diamond dress set, consisting of a pair of cufflinks and four studs with clips each with circular onyx face in the shape of a button, set with four Swiss-cut diamonds millegrain-set in platinum collets, and a pair of collar buttons each with a circular onyx face millegrain-set, each set to the centre with a swiss-cut diamond in millegrain-set collet, to yellow metal back, in fitted case of Hamilton & Co, circa 1925s,

No. 27751M