Vintage American Solid Silver Red and Blue Enamel Gilt Ball Cufflinks

A vintage pair of solid silver and enamel gilt ball cufflinks featuring a small sphere divided into alternating panels of red and blue enamel with a cabochon of onyx at the apex all with a gold wash over silver on a prong lever back setting - marked Sterling and an unidentified star mark - total weight of the pair 12.5grms - diameter of sphere 14.5mm - c.1985 USA