A case of a collector coin which was not meant to be circulating: A while ago, I found this 1995 $1 Waltzing Matilda (Canberra mintmark) coin in my change despite the coin being (in theory) a coin only released carded.
I guess someone might have gotten this as a gift and decided "Screw it, I'm buying something with it".
When I posted it on another forum however, a number of people said they also found this coin in their change so someone speculated that "surplus" coins (i.e. those leftover after other were carded) might have simply being released as circulating coins.
I was noodling through a 10kg lot of world coins and found 2 1975 PNG 20 Toea coins.
The one to the right is the usual silvery colour while the one to the left is uniformly bronze coloured (obverse, reverse and rim). I am 99.9% sure that the bronze is *not* a case of being minted on a wrong planchet but simply a case of the outer layer having being stripped.
What I'm wondering though is this: What would be required to strip *all* of the outer layer without damaging the inside ?