James Lavin’s ”A History ofSpanish Firearms” has many maker’s marks in it. That ”crown over rectangle” was widely used by many different makers, usually spelling their names out in 2 or 3 lines in the box, so each line has 2 or 3 letters of the name.Therefore, if you can decipher some of the letters, and determine the row and position of each recognizable letter, we might be able to tell who made the lock from the many pages of examples.
ANT.
GO
MEZ
is how Antonio Gomez put his name in the box, as in WESTbury’s example. There are dozens of others.
Your lock is the typical Spanish “patella” type, with the mainspring acting upward on the heal of the cock, and the little foot (patilla) in front of the cock engaging the noted cylinder of the half cock sear as well as the rectangular full cock sear.
Nice lock. If you can deduce some letters and positions in the box under the crown, post them and we can see if they match any of the dozens of maker’s marks.
Bill Paton