A $5 coin for the 75th commemoration of the landing at Gallipoli came out I guess in 1990. Anyhow, as you could get them from the bank at face value, I bought 20 of them and spent them around town just to watch people's reaction. I suppose they were all kept as souvenirs or ended up back at the bank again. No-one ever gave me one in change, though I did get a current New Zealand 50 cents this morning pretending to be an Aussie 10 cents.