Your gun would have been made in 18XX. The best source of information on the Mantons are the two books by W.Keith Neal & D. H.L. Back "The Mantons: Gunmakers" and "The Manton Supplement.
Many guns are listed by serial number in both books. A very detailed study of the Mantons.

If you send me the pictures I post them for you.


MP Sadly Deceased as of 2/17/2014