From the pics it would appear that the finish is not in that great of shape. It could be just the camera making it look that way. I can still buy the old Ballard rifling Marlins around here for $250-350 bucks in near pristine shape. From chats with my FIL a few years ago, these rifles bring more money up north as he couldn't believe some of the prices I was paying for mint condition 336 SCs, which is the carbine version of the 336. I collect the SCs and the most I have in one is an unfired 32 Winchester Special that I paid $125.00. I would suggest checking the local market as the prices are subject to demand and here a short range weapon doesn't have much value. Everybody here wants a magnum to shoot our small deer (80lbs) at yardages of 100 or less with a 12+ power scope. Yeah, they walk among us here. Only us old coots are picking up these old shooters here and one day, these things will be recognized for the incredible shooter that they are. Then the cash register will ring.
Might try an online gun auction website and see what's available that's close to yours.