Vintage Art Deco Sterling Silver, Onyx & Marcasite Earrings

Stunning Vintage Large Art Deco Sterling Silver, Onyx & Marcasite French Clip Earrings. These are pierced earrings; the French Clip is an extra secure closure (see photo). Marked Sterling, with a Maker's Mark I can't recognize (any help would be appreciated!) Measure approximately 1.25" x 1", weigh about 15 grams. In beautiful condition.