GB I'd place it a little earlier, in the style of the sort of advertising giveaway from the 1930's. Closer examination reveals a sliding printed backing enabling the viewer to put any of the listed major towns and cities as a starting point, and the distance from this point then appears in the windows. It's the equivalent of the free pen with the company logo and contact details number, a constant reminder of the product. So a useful thing to have to hand at the start of "motoring for pleasure."
The copy reads more like snake oil, and must be the only petroleum based lubricant not to mix with the fuel of the day....so no good for Mr Average and his putt putt ride to work 2 stroke bike.
Petrol prices in the 1960's seemed fairly constant, there was a great disquiet when it went up from 5/4 to 5/6. Regent, Esso, National, Power were a few I remember as a kid. Dad wouldn't use Shell, it was always more expensive and the choice of the well heeled Jaguar and Rover driver. His favourite had been R.O.P. Believe it or not it was oil imported from Russia to the UK in the 1930's, and was good stuff. World events changed all that.
I think todays regulatory bodies would not agree with any of the claims made here, but still an interesting diversion that raised a smile.
The Miller name lives on as a supplier of lead replacement fuel additives, whether this is the same company, who knows?
Thanks for posting.
Swarfy
