Hi - the reverse is the same as the GB crown though? was there two types of aussie 1937 crown? Looks like a mule. How it would come about though, I'm not sure. OK, feasable, because presumably they are the same size and were struck at the same time by the mint. Oops, no. Apparently the Aussie coins were struck in Melborne. I wonder if someone has concocted it? What does it weigh argentum? Hi, the coin weighs 17.3g