The words were barely legible, although it was apparent that there were two colours of text and a logo. However, some messing around on Photoshop reveals the wording:
STOCKISTS OFPAMMELPAMMASTICPLASTIC EMULSIONCOATING BLUNDELL
'Blundell' was actually Blundell, Spence & Co, founded as a partnership in 1811. They manufactured paint in Hull - a center of the paint industry then, as white lead was produced there - and by the twentieth century were exporting their products around the world. Subsidiaries were established in India, Chile, South Africa and Australia. The company would merge with Permoglaze in 1960, although the Blundell Spence name remained in use for another five years.
Pammastic was a well-known brand name of the 1950s. It was a polyvinyl acetate ('plastic') emulsion which didn't need undercoat and dried quickly. Its sister product Pammel offered a gloss 'enamel' finish in a range of colours.