Ivor Johnson 12 gauge double barrel
I have an old "Ivor Johnson Sporting Goods, Knox-All, Boston, Mass." 12 gauge, double barrel, side by side, shotgun with the serial no. 99473. It's in excellent condition. I'm wondering about how old it is and whether there is any value to it? It was given to me by a neighbor when her husband died so I know nothing of its history.