After some further attempts to gently clean the coin up, it came up clear enough to make out some other features. The reverse side showed up 10 PenniƤ and 1867 - upon researching this its an 1867 finnish coin
I have found some really bizarre coins out there, including, a 5 centimes from 1854 with Napoleon 3rd on it and coin from Nova Scotia, to name a few...as for where I found it, near my home in Scotland, South Lanarkshire, its a large wooded area