The measurements on the Wikipedia page would have most likely come from the Renniks Australian Coin and Banknote Values 19th edition or 2004 Standard Catalog of World Coins: 1901–Present catalogs as they are what are referenced as the sources for all the information on that page. The measurements in the Numista catalog would have come from individuals who would have used their own tools to measure the coins. Latter I will go through my catalogs and correct any measurements that may be inaccurate.
