G'day, I think Steve might be on the money: look at the shape of the discolouration. This suggests to me that the coin has spent a long time between other objects.
Not entirely relevant to this coin, but to Davey's post: when the 1964 Oz pennies first appeared, they were noticeably redder than other pennies. I never got an explanation for that.
Peter in Oz
Not entirely relevant to this coin, but to Davey's post: when the 1964 Oz pennies first appeared, they were noticeably redder than other pennies. I never got an explanation for that.
Peter in Oz