Angostura’s Cask Collection. No. 1 Oloroso Sherry is the third expression in the cask collection family and from a first fill Oloroso sherry cask. Blended with rum aged up to 22 years, this exquisite, intricate rum colors a beautiful amber with crystal clear clarity, offering flavors of woodiness, roasted nuts and hints of sherry, with a medium rounded and oaky finish.