What is the age and value of a 410-44 caliber Monitor shotgun?

Monitor Shotguns

This was a trade name used by the Paxton & Gallagher Hardware Co, Omaha, Nebraska (1880 to 1935), on guns made by Crescent, Harrington and Richardson, Iver Johnson, and J Stevens. Since it is marked for either 410 or 44, it is probably chambered for 2 1/2 inch shells which are not readily available today (any gunsmith can measure the chambers to be sure). This would definitely reduce its value as a shooter, but might generate a little more intrest from a collector, but it is unlikely to bring more than $200 in like-new condition or $50 if busted or rusted.