Café Royal Cocktail Book by W. J. Tarling (1937, p.208)

1 dashBenedictine — swill glassbase
0.5 partgin — Dry Ginbase
1 dashorange bitters — Orange Bittersbitter
0.25 partdry vermouth — French Vermouthmodifier
0.25 partsweet vermouth — Martini Sweet Vermouthmodifier
  1. Swill cocktail glass with dash of Benedictine.
  2. Stir without ice.

Invented by V. A. Tooth.