Nice! Bet that was used for cutting red hot rout iron? I see a striking point on the back side of it, so it was made to be wacked with a hammer. This may have been a black smithing tool? VERY NICE FIND!!!!
Black smiths used very small tools like this to make leafs, wheat and other designs in red hot metal objects. I would bet this was made for fine inlay and designs in rout iron work.