Thanks everyone for responding so quickly. And thanks for the wisdom and advice. I really appreciate it.
The markings on the left side of the barrel of the Model 12 are:
Winchester--Model 12--12 Guage Full
trademark Winchester Proof Steel
Made in USA
FOR SUPER SPEED &SUPER-X 3IN.
It also has the numbers 1587627 on the underside of the barrel and again less than an inch away on the body of the gun and just behind the trigger guard there are tiny initials that appear to be jp ???
It doesn't appear to have ever had a rib on it ...several of my dad's other guns have vent ribs on them, but not this one.
