Jack's Manual by J. A. Grohusko (1910, p.37) — For parties

1 bottlerye whiskey base
1 pony glassBoker's bitters bitter
1 pony glasscuracao — Curacaomodifier
1 bottleItalian vermouth modifier
1 funnelice — fine iceother
  1. Mix the rye whiskey, Italian vermouth, curaçao, and Boker's bitters well together.
  2. Pass the liquor through fine ice into a bottle, cork well, keep on ice until ready to serve, and serve.

Ice: Fine ice

See also: Bottled Brandy Cocktail, Whiskey Cocktail

Source says to keep on ice until ready to serve.