Both stories are difficult to verify because records of drinks at the time are missing or incomplete, but the 1887 edition of Thomas' The Bar-Tender's Guide includes a recipe for the Martinez.

Byron released just a few years earlier also listed a recipe for a cocktail called the Martinez by saying only: "Same as Manhattan, only you substitute gin for whisky.

A later 1888 guide by Harry Johnson, the New and Improved Illustrated Bartender's Manual, listed a drink that may have been incorrectly spelled as the "martine", without the letter "z".

Over time the alcoholic drinks further evolved regarding both their ingredient construction and names to become what were eventually considered as two different cocktails, the Martinez and the Martini.

[9] In the 1940 The Official Mixers Manual by Patrick Gavin Duffy the drink calls for gin, dry vermouth, orange bitters, and "4 teaspoons Curaçao or Maraschino".