The rear is stamped 9ct, pin is 5.7cms high and overall weighs approx 0.8 grams. The knob of the pin is gold, has a dent, the pin itself is base metal.
This really is a quality piece of vintage jewellery. Weighs approx 3.5 grams and is English ring size N.5. Stamped 375 (9CT) to the band. There are other unknown hallmarks, too hard to read. Superb condition.