This is a unique piece of jewelry by Norway’s Aksel Holmsen. His jewelry is sought after & prized. I was not able to find another piece like this one. It is. Marked Sterling 925 & hallmarked Aksel Holmsen. Aksel Holmsen, Norway, Antique Brooch, C Clasp, Modernist, Guilloche, White Enamel, Oval Shaped, 1 By 1.25 Inches