IBA official recipe includes:
Components
40 ml – Gin, Old Tom
10 ml – Maraschino
10 ml – Lemon juice, fresh
2 dashes – Orange bitters
Preparation
Pour all ingredients into shaker with ice cubes. Shake well. Strain into chilled cocktail glass. Garnish with lemon twist and a maraschino cherry.
* Notes – Serve without a straw.
Enjoy ! ADB
This version of the Casino Cocktail first appears in 1909, in The Reminder (3rd edition) by Jacob A. Didier.