The Courier model 4 was manufactured by J. Wiseman & Sons Ltd in 1928, it was in production for about 2 years.

4-valve Courier set - their flagship radio, worth £27 10s

Patented (NZ Patent 59508) band-switching - a world first by Herbert Edward Parsons, who was likely the radio engineer designing the sets sold by Wisemans.  He could possibly be one of the three men in the photo shown on the main Courier model page...

Technical Information

Valves (4):

Chassis Notes(most schematics can be clicked to download a full size version)

Courier model 4