if you have a copy of the data book..isbn 1-892495-09-0 there are many similar units on page 50 though these are dated at around 1935 ish and most except for one which is a Bowden appear unmarked , look really closely it is likely that somewhere there is a mark..a bit like finding a signature on an old work of art...on the page the brakes are also the opposite hand.
Steve Chambers
Chesterfield
England