The misquelet lock was in use for a very long time. This is a much later example circa 1800, again made for "the trade" within the Ottoman empire. What appears to be a damascus barrel is in fact known as damascene. A technique that was used to decorate the barrel surface. It was often done using silver or gold. This one is another type of faux damascus. The damascene is attempting to duplicate crolle. This would have been done using "stamps" while the barrel was being worked in the forge. Manfred Sasche duplicates this technique in his book.
Some of books mentioned are difficult to obtain and certainly they are relatively expensive. Here is a decent on-line tome worth looking at:George Cameron Stone
"
Glossary of the Construction, Decoration, and Use of Arms and Armor in All Countries and All Times", 1999.
About the Miquelet lock:
http://books.google.com/books?id=A4Rp_Qx9in4C&printsec=frontcover&dq=miquelet+lock#PPA234,M1"Definitions" for this subject are sensitive to time and culture. What we refer to as damascus was generally known as "watered steel"
http://books.google.com/books?id=A4Rp_Qx9in4C&printsec=frontcover&dq=miquelet+lock#PPA320,M1Pete
