The Old Waldorf-Astoria Bar Book by Albert Stevens Crockett (1935, p.38)

0.5 partdry vermouth — French vermouthbase
0.5 partScotch whisky — Haig & Haig Scotch Whiskeybase
  1. Build the French vermouth and Scotch whiskey with ice.
  2. Serve in a cocktail glass.

See also: Beadleston