El Bar Americano en España by Pedro Chicote (1927, p.139)

ice — 3 ó 4 pedacitos de hielobase
1 copitawhisky — 1 copita de whiskybase
agua filtrada fría — Used to fill the drink.dilution
1 slicerodaja de limón — 1 rodaja de limóngarnish
nuez moscada rallada — Added after filling.other
1 tablespoonazúcar en polvo — 1 cucharada de azúcar en polvosweetener
  1. Build in a large whisky glass with ice, sugar, whisky, and a lemon slice.
  2. Fill with cold filtered water, add a little grated nutmeg, and serve in the same glass.

Ice: Ice

Chicote marks this one as cold.