I purchased from my grandfather in 1966 a Belgium Browning 12ga lighting browning shotgun. I would like to no what it is worth.This is what is on the gun. Pat no. n2203378-223386 Made in belgium. Also Browing arms co,St Louis montreal pq special-12ga.Also states is a lighting Browning 12ga 2 3/4 inch shells. Thanks for any info in advance.