Weighs approx 12.2 grams and is 44mm in diameter. Stamped PERU 925 AND 18K to the rear. Ever so slightly out of shape.
In nice condition and looks to date to the 1930’s / 1940’s and has an Australian hallmark. Measures 5cms x 2.8cms and weighs approx 7grams. Fitted with a good pin that has a safety latch.