My thought on this piece is that this rifle is not so much a Wogdon made rifle, but that it is a German rifle with a Wogdon lock and possibly a Wogdon single set trigger; certainly a Wogdon made trigger.
https://www.gunbroker.com/Item/967890489Seller's description
"ROBERT WOGDON PERCUSSION CONVERSION RIFLE .50 CALIBER
On consignment we have a Robert Wogdon .50 Caliber rifle, converted from flintlock to percussion. This rifle features an intricately worked stock with brass fittings, a patch box with sliding cover on right side of buttstock, a Wogdon lock with excellent function, and a 21" octagon barrel with brass front sight and iron rear sight. There is a name etched in silver on the barrel, but the first letter was cut off when the rifle was converted. Caliber is .50 with 7 lands and grooves, bore is very good for the vintage. Wogdon was known for his flintlock dueling pistols, including the ones used in the Hamilton-Burr duel.
Additional information provided from the consignor: The gun was the property of one Victor Mayer Amede Mannheim, born in 1831 and inventor of the modern slide rule. Married to Eugénie Adèle Mathilde Oulif or "Mattie", her name appears on the barrel of the rifle as Mattie A Mannheim. The first 'M' of the name was eliminated when the gun was converted to percussion."
The architecture is German, I don't see any English influence that I would expect if it were a gun that Wogdon built using a German barrel.
What is your opinion?
Mike