Hi 1640
Congratulations !!! Nice, big, early lock. Yes, probably about Mid-17th Century. I too saw this in the auction. But since retirement, I'm not buying much anymore. But I like to keep up with the auctions.
The lock is sometimes loosely referred to as a Naples style lock. The confluence of both Southern and Central features. And you see this often. As mentioned, you notice the mainspring operates off the heel of the cock (Spanish style) versus the toe of the cock (Roman style). Notice the large lock plate is not unlike their matchlocks and wheellocks of the earlier period. Also note, the extra long length of the top screw. You see this on miquelet locks especially from around the turn of the 18th Century and earlier. I've often thought these longer top screws were to allow a variety of flint shapes before the "shaped" flint became more of an industry.
Again, Congrats. A cool addition to a lock collection. Although, it would be fun to have an early Italian style musket made using same. LOL
Please do post your other locks individually. And thanks for posting.
Rick