Thank you, and you are right indeed, Marcus,
But the ultimate work on flintlock weapons still is Dr. Torsten Lenk's
Flintl°aset, dess uppkomst och utveckling from 1939. Sadly, the photos in the English edition
The Flintlock - its Origin and Development in one volume are much worse than in the German 2-volume edition
Steinschloss-Feuerwaffen, 1969.
Lenk pictures some firearms with locks almost identical to your instance and assigns them to the 1640's for Paris (!), as I did at first.
I once owned a heavy flintlock wallgun employing a very similar mechanism of ca. 1645:
http://www.vikingsword.com/vb/showth...5+schloss+dyck
m