A young chemist named Dr. Cyril P Callister, hired by the Fred Walker Company, develops a remarkable and distinguished new spread from brewer’s yeast.

It’s appealing taste is backed up by its credentials as being one of the world’s richest known sources of natural Vitamin B.

It is sold in a two ounce (57g) amber glass jar, capped with what was known as a Phoenix seal, to keep the contents fresh.

It is labelled ‘Pure Vegetable Extract’.