Daryl,I have an advertising poster for the Powell top lift lever guns. This poster pictures the gun both as P.F. and C.F.This poster is reproduced in Douglas Tates book, "Birmingham Gunmakers", page 93. Your gun is in my opinion, the C.F. version.A simlar gun #5709 previously in my collection was verified from the records at Powell,s as being manufactured as a C.F.
Powell,s have excellent records on the history of their numbered guns.Prior to the sale of the business,it was possible to obtain "gratis",details of the origional transaction.

Roy Hebbes