Jameson 21 Years is a blend of rare pot still and single grain Irish whiskeys that were initially matured in a range of ex-bourbon and oloroso sherry seasoned casks at the Midleton Distillery for 18 years. Following on from that initial period of maturation, these whiskeys were then blended and re-casked into freshly emptied ex-bourbon barrels for an additional three years. Limited to 2301 bottles.