Hello, Raf.
No. This is a key (lock) called "molinhas todays date". The average riding (half cock) is achieved with the piece that sees before the cat foot) cock) moving manually to engage the tooth can also be seen in the front of the foot cat (cock). In turn, to reach its maximum position (full cock) a projecting part of the shoe (cock) on the bottom hook removed in (dog) and keeps out the tooth. It is a variant of the mediterranean keys.
http://www.invaluable.com/auction-lo...pistol-carbine
Fernando K