I have a Keith Prowse English concertina (48, Cheapside) with brass reeds, serial number 5543.
The label on the reed pan is Wheatstone at 20, Conduit Street.
The action is very neat and looks like Lachenal construction with saddles as in the Wheatstone patent.
I have attached some photos.
Question: would it be a Lachenal reed pan even though it has a Wheatstone label? Or would Keith, Prowse have had one factory do the action and another the reed pan?