Looks like an English export/import lock to me. Some call them "warranted" locks because they are often stamped that way.
The style dates to 1800 plus or minus, but the inexpensive locks often continued out-of-date styles for a couple decades. This one appears to be pretty inexpensive even though it has a stirrup linked mainspring and a roller frizzen. Some of the decoration on the lock plate looks to be stamped and some engraved.
You didn't give any dimensions, but it looks small like it might be a pistol lock.