I picked up this 16 gauge hammer gun today. Straight gripper with 65 cm barrels. Found in an attic and it appears to be unfired but has some pinprick corrosion on the outside of the barrels, bores are perfect. Top rib is marked "Acier Cockerill" which I know mean Cockerill steel. Please see large Eagle with crown on the barrel breeches in the first pic, and glyph that's behind the knuckle in the second one. Can anyone please tell me what I have?