..I invented it at the Embassy Club in London, 1921. Mayfair is the aristocratic quarter of London, called so because of the reign of Charles II (seventeenth century) they used to hold a yearly fair there during the months of may.
In fact this drink was created by a fellow Belgian Bartender called Robert Vermeire in 1921 when he was working in the "Embassy Club" in London.
Following is from his 1922 "Cocktails : how to mix them"
Mayfair Cocktail
Fill the shaker half full of broken ice and add :
1/4 gill of Dry Gin
1/4 gill plain Orange Juice
3 or 4 dashes of Apricot Syrup flavoured with a little Cloves syrup
Shake well and strain into a cocktail-glass. This cocktail possesses a delicious flavour ...