 After five years, whiskeys from the respective light and dark sherry casks were then vatted together and allowed to mature for an additional five years in neutral oak.Mitchell & Son's whiskey was originally marketed as "Pat Whisky", with the labels featuring the logo of a man on a green background.However, in 1933, it was rebranded as "John Jameson & Son 10 Year Old Green Seal" and later became known simply as Green Spot.