The Buffet Blue Book by John H. Considine (1912, p.68)

2 dashAbbott's Bitters base
1 jiggerrum base
1 sliceOrange — orange slicegarnish
0.5 jiggervermouth modifier
  1. Stir the Abbott's Bitters, rum, and vermouth with ice.
  2. Strain into a cocktail glass and garnish with an orange slice.

Ice: Ice