Café Royal Cocktail Book by W. J. Tarling (1937, p.144)

0.3 partCanadian whisky — Seagram's V.O. whiskybase
0.3 partgin — Booth's dry ginbase
0.2 partdry vermouth — Martini dry vermouthmodifier
0.2 partvan der hum — Van der Hummodifier
  1. Shake with ice.

Ice: With ice

Invented by F. G. Hunt.