U.S.A., 1930's

Xerox Sinclair meter franking
 
Tony Johansen Sinclair meter franking
From the nineteen thirties until the fifties, the Sinclair Oil Company used this meter franking to advertise their motor oil. They chose a dinosaur as company logo as a symbol of the great length of time their oil spent in the ground.
This apparently very rare item is probably the very first occurrence of a dinosaur in philately.
The scan of the red specimen was kindly provided by Tony Johansen. I have also seen a blue specimen of this franking, used in New York.
Note the different words, 'Opaline motor oil' and 'Pennsylvania motor oil'.
 
TvE