Hi Richard,
The name on the lock was reported to be "Tems" a maker who is absent from all of my references. The barrel is marked London, and in the original posts of the gun, the owner thought Birmingham proofs. However, I strongly suspect the owner mistook private tower proofs for Birmingham given the likely mid-18th century date of the gun. The hardware is Paktong, which is just naturally occurring German silver. At the time it was a rare mysterious mineral from the orient and was more valuable than gold. Then some metallurgists in the early 19th century discovered it was just copper and nickel and it was produced cheaply, first in Germany, and later elsewhere. The fowler was brought to the US from South Africa. While it is not a Bailes, the wire work could certainly be by the same artist Bailes used.
dave