These are counterstamped in location by RAM staff (there's a fair bit of variation so far). A few I've seen, have the counterstamp a little off-set below the 2014 - 2018. For those who like variations, keep an eye out. https://eshop.ramint.gov.au/latest-news-with-desc.aspx?NewsID=151
A little of the topic but this did draw mt attention. When i clicked your link i saw the RAM sells jewelry. I am gobsmacked at the PLATED gold products and the crappy looking sterling. What an absolute joke the prices i see. A gold plated bracelet for $400+? LOL !!!!
First strike of these was at Wollongong NSW 22 October 2015. Second strike was Newcastle NSW 24 October 2015. More details can be found here: http://www.ramint.gov.au/media/noticeboard/2015/20151014.cfm
