The top is ever so faintly stamped CARTIER and beside this is what looks like a serial number, but it’s very rubbed, possibly 352?. Good weight approx 22...
Heavy set, weighs approx 12.2 grams & measures 36mm high x 26.5mm wide. Not stamped but tested between 10k & 14k. Engraved to the rear B.P.O.E. ALBERT SWEARER No198 Nice condition.