12 gauge 30" barrels

Although I did inherit this Old Midland Double gun It holds NO sentimental value to me at all. I would like to sell it for something I would actually shoot. My research tells me it is from the turn of the century thereabouts? Can anybody give me an approximate value for this shotgun? Here are a few pics and a link to an album with a bunch more. It shoots fine, the auto safety and double triggers work. it is just not something that interest me.
Thanks for your time and hopefully help.
Mike
http://s26.photobucket.com/user/lowerstage/library/Birmingham%20double%20gun?sort=3&page=1