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 ...
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 ...