I have a friend who recently got her father's browning shotgun. She doesnt know alot about the gun. It says it's made in Belgium has alot of engraving on it. On the side of the barrel it says 16 special steel. Doesn't give a gage size or a shell sizes. On the receiver it has stamped F.N inside a circle with a star below it. Has the number 98981 stamped below the star. Any ideas on how she can find out the gage the size of shell and the age?