Picked this up today . After hours searching on " professor google " And nothing Any info appreciated . My best , the Chisholms were/are a musical family & bought this & got it engraved ' Not much to go with just ' The Chisholms " 1/2 oz silver round No idea what the engraving refers to
From the Perth Mint website. While they don't have that design as it's from a while ago, they do say you can have 1/2oz and 1oz and you can also buy them from the Perth Mint shop https://www.perthmint.com/shop/gifts/personalised-medallions/customise-your-medallions/ This may be helpful https://www.australian-coins.com/coin-news/perth-mint-off-metal-trial-strikes-what-are-they/
I believe these are done on a machine when you're on tour through the mint, and you choose the wording.