 These whiskeys were aged at least six years in Gilbey's own sherry casks at its bonded warehouses on Dublin's Harcourt Street.By 1903, a whiskey known as John Jameson & Sons Castle "JJ Liqueur" Whiskey 12 Year Old was marketed in a bottle of similar shape and markings to those used for subsequent bottlings of Redbreast.This whiskey was produced using distillate sourced from the Bow Street Distillery in Dublin, the home of Jameson whiskey.