What is the value of a 1963 12 gauge browning light twelve semiautomatic shotgun without the raised rib made in belguim?

I recently saw one at Gander Mountain priced @ $299. It had a crack in the stock so I feel it went cheaply for that reason. Most I've seen go for about $500 or more. I had my hands on this cheap one when someone else came with a salesman to unlock it so he could buy it. That's one I wished I hadn't missed.