Thanks heaps Spence! Jimmy, look closer at the dog shape and also the back of the Roo. There is also the left side of the coin on the reverse with a small mis strike. I am not the best with the pics unfortunately.
I lose clarity with the magnification but where you see dark outline that is actually shadow created by the raised edge. Same with the Roo's back. Taking to see a coin dealer today so will report back his findings also.
Firstly apologies to Coinfrog and all that said it was a stain. What you guys can see in a photo that I couldn't see even with a loupe is amazing. The 'edges' were just dirt. So Snowy the dog is now dog gone. You guys seriously rock!