Cocktails by Piero Grandi (1927, p.25)

0.33 glassgin — Ginbase
2 wholestrawberry — fraisesgarnish
0.33 glassdry vermouth — Vermouth Francaismodifier
0.33 glasssweet vermouth — Vermouth Italienmodifier
  1. Mix the gin, dry vermouth, sweet vermouth, and strawberries well.
  2. Serve in a cocktail glass.

Garnish: Strawberries

The Art of Mixing by James A. Wiley and Helene M. Griffith (1932) — Wiley 1932, opening A-B recipe run

0.33 partLondon dry gin — Ginbase
2.5 berriesstrawberries garnish
0.33 partdry vermouth — French Vermouthmodifier
0.33 partsweet vermouth — Italian Vermouthmodifier
  1. Shake well and strain, leaving berries if desired.

Garnish: Strawberries

Source notes it was introduced in London by the Duke of Manchester.