What is the value of a Savage Arms 24c-dl 20 gauge?

i my self own a 24c types but mine has the break open lever under the gun and i have been told that the new ones savage is makeing are 1200 but the i i have i was told 300 dolars was about right i bought one because of the uniqueness but was told the value of mine to be 350 plus. its a 24c 22 on top 20 ga on bottom. on the side of the barrel it states not to fire shotgun barrel with scope attached. any other info on this would be appreciated. value or history