El Bar Americano en España by Pedro Chicote (1927, p.1)

dry gin — Used to fill the drink.base
ice — 3 ó 4 pedacitos de hielobase
6 dropsorange bitters — Orange bittersbitter
2 coffee spoonMarie Brizart other
  1. Agítese muy bien y sírvase en copa de cocktail.

Ice: Ice

Cocktails by Pedro Chicote (1928, p.114) — Fill with dry gin

dry gin — Source says to finish filling with dry gin.base
6 dropsorange bitters base
2 coffee spoonMarie Brizard modifier
  1. Shake very well and serve in a cocktail glass.

Ice: Ice pieces

This matters because it preserves a minimalist sweetened dry-gin branch in the Madrid canon.

See also: Martini Cocktail, Angel Kiss Cocktail