I'm just guessing, but the floral motif looks Victorian to me - 1880's - 1900's. The size and shape of the object are consistent with a hair barrette.
I concur with late colonial period. That's due to the type of manufacture. I do not think it's part to a musket, however it's really neat. I haven't seen anything quite like it before.
Horse tack? Part of a bridle?