That sir is what @lordmarcovan calls a circameo. If he wakes up he might grace us with some wisdom. You know how Royalty is...always napping.
But seriously I do like those coins that have that dark ”Cameo” look to them. That one looks like a nice example, no premium in collectablity or value is expected for this coin but darn fun coin indeed.
Hard to tell much from the pictures, but that does have a bit of a CircCam appearance to it. It's almost certainly due to environmental damage, as mentioned, but it's still neat looking.