The Glenfiddich Solera Reserve is actually the Glenfiddich 15YO. It was launched around 2000 and called Glenfiddich 15YO Solera Reserve. Last year, the company went through a global packaging change and unfortunately the word "solera" did not translate in a lot of countries. Therefore, it is simply now known as Glenfiddich 15YO. The liquid is exactly the same, incorporating the "solera aging process" that uses used sherry casks, used bourbon casks & new oak casks to produce the fabulous flavors that your dad loved. The holidays are quickly approaching - a perfect gift for him!