the number is not in the book, but its a G grade that needs some cleaning up
what are the bores like? since you know the wood needs work or replacing, I would want very good bores to start the project with
and you would need to take a close look at the Moore Wm Moore apprenticed to Manton, and made guns under a couple names, the WM Moore and Grey's were sometimes very nice guns. (a search on doublegunshop's forums will find several discussions of them)
Check the Proofs on the Moore carefully - Moore was on one the names often put on cheap JABCs to deceive the gullible
a Wm Moore & Grey
Hybrid Mode