I woke up this morning thinking about this coin, which I have had tucked away for a couple of years.
The Swan (or |Goose) dollar was designed to be a candidate for the new Australian decimal coinage, but was rejected. A small number were minted by Pinches in London, and they are now quite collectable. Unfortunately there are now quite a few fakes out there.
I found this one in a local auction and paid a fair bit for it as I recognised the rarity, but I got it on reserve as no one else bid. I am fairly sure it is genuine - I saw it when it was brought in to the auction house in a tin with a few other random British and foreign coins from a house clearance.
Here is the Numista page on it: https://en.numista.com/catalogue/exonumia78083.html
And the linked information on identifying fakes: https://www.australian-coins.com/collecting-coins/1967-australia-1-dollar-pattern-crown-goose-dollar-90-silver-copy-coin-counterfeit-fake/
I know we have a few Australian contributors on here, so I would be interested in confirmation that it is genuine, and some indication whether these are still sought after or the fakery has killed the market for them?