Jack's Manual by J. A. Grohusko (1910, p.77)

0.9 portiondry gin base
0.1 portionPaychaud's bitters — Source gives 10% Paychaud's bitters.bitter
ice — broken iceother
  1. Stir the dry gin, Paychaud's bitters, and broken ice.
  2. Strain and serve.

Ice: Broken ice

See also: Gin Cocktail, Nicholas Cocktail