Cheerio! A Book of Punches and Cocktails by Charles (1928, p.23)

0.67 drinkdry gin base
0.17 drinkgrapefruit juice garnish
0.17 drinkFrench or Italian vermouth modifier
ice — Add ice.other
  1. Place the dry gin, grapefruit juice, vermouth, and ice in a shaker.
  2. Shake well and serve in a cocktail glass.

Ice: Ice

See also: Orange Blossom Special, Gin and Italian

Source allows either French or Italian vermouth.