Colt outsourced the manufacture of those guns but did inspect, market and sell them. I understand they will furnish a factory letter for them. More information and values can be found in "Percussion Colt Revolvers-The Second Generation-Collector's Handbook and Price Guide" by Dennis Russell. Values can also be found in the second edition of "Blue Book of Modern Black Powder Arms" by Allen and Adler. I don't have either book so I can't give you a value guesstimate.