This design is “period correct” for the American colonies circa 1710-1780. This striker is made of high carbon tool steel. It measures 3/16 inches thick, 3/8 inches wide and about 3 inches long. The steel has been heat hardened to throw hot sparks. The striker was nicknamed “rat tail” by the Europeans because of the shape and form of the handle.
The absence of a bottom “curl” allows you to get the striker (and subsequently your sparks) closer to your char cloth making it easier to “catch a park” and start your fire.