Down the Hatch by "Paul" (1920, p.20) — Down the Hatch 1920

Absinthe — Flavor the glass with absinthe.base
0.5 jiggerBourbon whiskey — Bourbon Whiskeybase
1 tsporange bitters — Orange Bittersbase
1 oliveOlive — Put an olive into it.garnish
0.5 jiggerFrench vermouth — French Vermouthmodifier
1 tspItalian vermouth — Italian Vermouthmodifier
  1. Put in the glass that you strain it into.
  2. Flavor with absinthe and put an olive into it. Must be very dry. No sweets.

Garnish: Olive

This matters because it preserves an explicitly very-dry whiskey-and-vermouth branch that sits between Manhattan and Martini logic.

The source's insistence on dryness and the absinthe-flavored glass are the important details.

See also: Martini Cocktail, Manhattan Cocktail