An English (Jacobian) Lock is a type of early flintlock though it was preceded by the snaphaunce and followed by what is generally termed a Doglock (though the English Lock will probably have a dog as well). The English Lock would typically have had a lateral sear as well as bridled featherspring and cockstop. The dog was a safety. The English Lock, Doglock, and the final manifestation of flintlocks are subdivisions of the "common flintlock." Scandinavian flintlocks (sometimes called snaplocks, a term used for other types or almost all types of flint-using locks) might fit in there as part of the earlier timeframe but miquelet locks, which were a long-lived contemporary of all of these, don't...