Cheerio! A Book of Punches and Cocktails by Charles (1928, p.37)

1 partSherry wine base
2 dashesorange bitters bitter
1 partvermouth — Vermouthmodifier
ice — Place in shaker with ice.other
  1. Add the sherry wine, vermouth, orange bitters, and ice to a shaker.
  2. Stir thoroughly and serve.

Ice: Ice

See also: Sherry Cocktail, Vermouth Cocktail

Source says to stir thoroughly in the shaker rather than shake hard.