Stevens 311 series F SxS shotgun info?

I just got a Stevens 311 series F SxS 12 ga. Shotgun. I want to know how much it is worth and a little info on the date? The serial number is A600242. It has a 2 3/4 chamber. On the back of the barrel (where you take it apart) it has a letter K where it hooks on to the gun itself. Please only people who know what they are talking about answer! THANK YOU!