The Bentley 4 1/4 litre models were produced 1934-1939.
I have seen a catalogue, printed i 1937, with photos of the 2 and 4 doors saloon cars.
So I guess these wonderfull Bentleys are 1937 models.
Tell me if I am wrong!?
You are probably right. These are from a brochure that was reprinted in 1974. The only indication of date is the reference "Bentley Motors (1931) Limited". Rolls Royce took over Bentley in 1931 so that is probably the incorporation date.
I found this on ebay listed as a "1931 4 1/2 Litre Bentley Brochure". I wasn't aware that Bentley still produced the 4 1/2 that late and figured it was probably the 4 1/4 but I hoped it was a Bentley Bentley!
The 4 1/2 litre and 4 1/2 litre supercharged "Bentley" Bentley were produced 1927-1931.
The supercharged models were the Blower Bentley, winner at Le Mans.
Thus the 4 1/4 litre models in your contribution have to be "Rolls Royce" Bentleys.