16 gauge wards western field shotgun

trying to find out what year the gun is and how much it is worth model 30 serial sb662a

i can tell ya that it was made between 1915 and 1930 and is basically a stevens md 520 slide action shotgun,,dates for the wards models i'm not sure there are any records for exact years,,values would range from 150 good-250 if extra clean and in working condition to the right person..most of the savage /stevens pump shotguns don't have alot of collector intrest and mostly appeal to sportsman and hunters
bigcurt