Art Deco Vintage Reverse Carved Crystal /Glass Horse Gold-filled Cufflinks

Vintage (antique?) cuff links, reverse-painted with profile of a bridled bay horse’s head & neck under crystal domes. Background possibly mother of pearl. Gold tone setting. Hinged toggles work perfectly. These are beautiful objects with the patina of wear that one would expect of something well-loved & from the era of elegance. I don’t see any maker’s stamps.