Slightly worn. Weighs approx 30 grams & measures 41.3mm in diameter. The rim is stamped BRONZE with a tiny makers mark that looks like JB in a triangle. 

Measures 13cms in diameter & weighs approx 390 grams. 100% genuine, ex USA collectors estate. Exact age is unknown.   One of the Navy's oldest U.S. destroyer squadron organizations...

 

The medallion is most likely linked to the R.H.S UK not Australia. It measures 44mm in diameter & weighs approx 44.2 grams. Just wondering if the recipient is related to the...

60mm in diameter & weighs 98.7 grams. A tourist / souvenir piece.