Hi Fernando,
The mechanism does still function, but the sickle shape at the end of the dog/hammer is broken of, so when this is fixed it will hold the bayonet again.
The mode of operation would have been as follow. You fold the bayonet backwards towards the lock. The lock is put into half cock, this will move the sickle (or C) shaped end of the dog over the end of the bayonet. The blunderbuss is loaded, the pan is loaded. The lock is pput into full, the bayonet is still retained. The trigger is pulled, the dog snaps forward releasing a spark and also the bayonet (the sickle will move to its first position, and the bayonet will no longer be retained).
