National Benzole Mixture badge on perspex. C.1960s.
Concave centre.
 
Dimensions- diameter 10cm
 
Sold.
 
National Benzole was a petroleum brand used in the United Kingdom from 1919 to the 1960s. In 1957 the National Benzole Co. became wholly owned by Shell-Mex and B.P. Ltd (through British Petroleum) but continued its separate trading identity.
In the early 1960s National Benzole was re-branded as National and continued trading as a UK retailer of petroleum products until the early 1990s, when the brand was phased out by parent company BP.
 
source: Wikipedia. Edited & Citations removed