No published sn data that I am aware of.
Janssen Fils & Co if it has Belgian proofmarks or Crescent Fire Arms Co if it does not.
The barrel will be marked "Made in Belgium"
It will be marked on the receiver/barrel.
It should be marked on the barrel or recieiver.
Probably turn of the century
It will be marked on the barrel.
It will be marked on the barrel
It will be marked on the barrel, but that should be a 12 g shotgun.
It will be marked on the receiver/barrel where it was made.
Where will be marked on the barrel/receiver.
Shotguns are refered to by "gauge" not "caliber". It should be marked on the barrel.
Depends on what is marked on the gun.