Good one. Worth a try. Although if it was a really good design it might encourage everyone to save more
I'm a graphic designer - any time you want work done Bron, I'd be ultra-honoured to work for the Perth Mint and combine my two passions, precious metals and good design! Here's my website: www.dhdesign.weebly.com
That was still in use up until quite recently - extruded 100oz bars have it. Not sure when it started though.
Up to whenever we switched to the new logo, which was a few years ago, 2008 I think if my memory is correct. The swan in a circle has been used for ages, in various slightly different designs as it was reworked. If you're asking when the specific stamp (as opposed to general logo) was used, no idea.