Shane,
I'd start researching your old shotguns by checking over the barrels and receivers carefully for markings. Brand names in particular can be useful. I've found names like "Fulton", "Knickerbocker", "Hudson", "Lefever", etc on the internet and references to them on the various gun auction sites. Compare your gun's features with pictures on the gun auction sites. A little research will do wonders. Of the many dozens of name brands found, most were made by either small companies that only lasted a few years, or by large manufacturers that built them for most any hardware store that bought them in quantity. The odd-name double guns have little collector value, and are meaningful only to family members. It won't hurt to swap around parts and restore them to display status.
Goodluck to you in your search!