it looks sn english king
It's Austrian emperor Leopold I
on a beautifully preserved and toned thaler
According to wikipedia "Due to an extreme interbreeding among his progenitors, the hereditary Habsburg jaw was most prominent in Leopold. Because his jaw was depicted unusually large on a 1670 silver coin, Leopold was nicknamed "the Hogmouth". However, most collectors do not believe the coin was an accurate depiction"
However, I know for sure they depicted him like that on many coins, not just one...
edit: an interesting article on "royal deformities" http://georgielowery.hubpages.com/hu...-and-Disorders