Check the receiver and barrels.
download from Winchester home page, will be listed under manuals category.
From what I could find your gun is made by Winchester. It should say it on your gun somewhere though.
Try e-gunparts.com, MidWest Gun Works, Shotgun News, gun show, gun shop.
Depending on the model it can be found on the bottom of the receiver or on the barrel. how to find the year of a belguim browning over and under shotgun by the serial number 53125
Winchester
Library
It's a Belgian gun, the ELG is a Belgian proofmark.
Dixie
Check the receiver and barrel
Check the receiver, barrel
Blue Book of Gun Values