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The World's Drinks and How to Mix Them by Hon. Wm Boothby (1908, p.32) — Boothby 1908 (Ver-Gin spelling)

1 twistlemon peel — lemon peelacid
0.5 jiggerLondon dry gin — White Cross ginbase
1 dashorange bitters — One or two dashes.bitter
0.5 jiggersweet vermouth — Italian vermouthmodifier
  1. Stir the Italian vermouth, gin, and orange bitters until very cold.
  2. Serve in a cocktail glass.
  3. Add a squeeze of lemon peel.

Garnish: Twist of lemon peel

Ice: Very cold

Nose
Sweet vermouth herbs and lemon lead the aroma.
Palate
The equal-parts split gives the drink more wine weight than a dry Martini, but it still behaves as a compact aperitif rather than a lengthened vermouth service.
Finish
The finish is herbal, sweet-dry, and citric.
Summary
A gin-and-Italian-vermouth aperitif preserved under Boothby's explanatory Ver-Gin spelling.

Boothby's note is the important part here. He explains the name as Ver-Gin, a contraction of vermouth and gin, which is useful evidence for how the drink's title was understood before later readers regularised it differently.

Jack's Manual by J. A. Grohusko (1908, p.64) — Grohusko 1908

2 dashAngostura bitters base
0.5 jiggerPlymouth gin base
0.5 jiggersweet vermouth — vermouthmodifier
0.5 glassice — iceother
2 dashRaspberry syrup — raspberry syrupsweetener
  1. Stir the Angostura bitters, raspberry syrup, vermouth, and Plymouth gin with ice.
  2. Strain into a cocktail glass and serve.

Ice: Ice

Nose
Raspberry and bitters lift over the gin and vermouth.
Palate
This is a useful pre-war branch because it shows light berry sweetness crossing into the serious aperitif field without becoming a purely fruity drink.
Finish
The finish is cool, spiced, and faintly red-fruited.
Summary
A lightly berry-tinted Plymouth-gin aperitif from the named fringe.

Jack's Manual by J. A. Grohusko (1910, p.88)

3 dashesAngostura bitters base
0.5 portionPlymouth gin base
0.5 portionFrench vermouth — vermouthmodifier
ice — Use a mixing glass half full of ice.other
2 dashesRaspberry syrup sweetener
  1. Stir the Angostura bitters, raspberry syrup, vermouth, and Plymouth gin well with ice.
  2. Strain into a cocktail glass and serve.

Ice: Ice

The Buffet Blue Book by John H. Considine (1912, p.57)

0.5 mixing glassice base
0.5 jiggerPlymouth gin base
2 dashesAbbott's Bitters bitter
0.5 jiggervermouth modifier
2 dashesRaspberry syrup sweetener
  1. Stir the ice, Abbott's Bitters, raspberry syrup, vermouth, and Plymouth gin in a mixing glass.
  2. Strain into a cocktail glass and serve.

Ice: Ice

Cocktails (Metropolitan Club Washington DC) by Metropolitan Club, Washington, D.C. (1920) — Metropolitan Club standard cocktail

0.33 partdry vermouth — French Vermouthbase
0.67 partLondon dry gin — Plymouth Ginbase
  1. Frappe.

Ice: Ice

Harry of Ciro's ABC of Mixing Cocktails by Harry of Ciro's (1923, p.85) — Harry of Ciro's 1923

0.5 glassForbidden Fruit — Forbidden Fruit Liqueurbase
0.5 glassgin base
1 portionwhite creme de menthe — White Creme de Menthemodifier
  1. Shake well and strain into cocktail glass.

This matters because it preserves another forbidden-fruit side branch in a simple post-war cocktail form.

L'Art du Shaker by Dominique Migliorero (1925, p.71)

0.33 partFrench vermouth base
0.67 partPlymouth gin base
1 zestlemon zest — Lemon zestother
  1. Shake cold, strain into a cocktail glass, express lemon zest, and serve.

Garnish: Lemon zest

Barflies and Cocktails by Harry McElhone and Wynn (1927, p.83) — Pete Ormatt recipe

0.33 partForbidden Fruit — Forbidden Fruit Liqueurbase
0.33 partgin base
0.33 partwhite creme de menthe — White Creme de Menthemodifier
  1. Shake well and strain into a cocktail glass.

This matters because it preserves a compact late McElhone liqueur-and-gin side branch under an otherwise slippery name.

See also: White Lady Cocktail, Tantalus Cocktail

Use a mixing glass half full of ice.