Acier Cockerill is not the gun manufacturer, but the maker of the steel in the barrels. It means the gun has fluid steel barrels and not damascus steel. It probably dates from no earlier than late 1890's through 1940
IF it has a serial number (not required in the US until 1968) it will be stamped on the receiver.
We cannot tell the model from the serial number- but if you contact Merkel. they can.
Impossible to answer since no serial number was given.
Browning's web site has a sn search function.
"X" prefix indicates 1961
With serialnumber 57550 the gun is made ca 1963!!
The Savage 24S (not 245) was made in the late 60's though the late 70's. Exact production date can be determined through the serial number, if it's that important.
Unfortunately, no- other than an educated guess that you may have a Belgian shotgun. Acier is not a brand- it means steel. Many are marked Acier Cockerill- which is the company that made the steel.
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