Whoops! Took me a long time to get back to this, kinda got sidetracked....
Thanks for all the ideas, I'm leaning towards chemist's spoon now. It's too big to fit in your ear, and it doesn't seem built heavy enough for a wood carving tool.
It has what appear to be weld spatters on it, and yesterday I found a couple of chunks of melted tin and some iron scrap that looks to have been heated and bent in the area the spoon was found, so I'm guessing it was part of a blacksmith's tool kit. They used chemicals to achieve desired effects on metal.