One sold on Auction Arms for $321.00 in December. Yours might be worth more, but remember, something is only worth what someone else is willing to pay for it. This one actually sold. Condition also matters.
GunsAmerica & Gunbroker.com have lots of guns for sale, and most of them stay that way. You need to see what a comparable gun sells for at auction to get a better idea of what it's worth. Unless you are in no hurry and can wait. It might take a few years to get your price.
And don't expect a dealer to give you the full value.