The Reliquia (jewel) releases are some of the oldest sherry available.  Only 80 bottles of this are released a year for the entire world.

A very old Amontillado aged in the bodega del Toro. A combination of the solera “Soberana” with another very old one called “Hindenburg” from the Conde de Aldana soleras. Don Antionio Barbadillo (who passed away in 1921) used to trade ten casks of Manzanilla against one cask of this old wine.

"The NV Reliquia Amontillado is an extremely old wine, concentrated from its sheer old age. It wears a mahogany robe with a green rim. The nose is pungent, marine, with noble woods, hazelnuts and a touch of volatility. The palate is quite brutal, verging on the edge of being too much, but without crossing the line. It’s an extreme meditation wine, presented in a glass decanter, and sold in extremely limited quantities. A bottle would last for months (or years), as it should be sipped in very small quantities instead of a Brandy, Cognac or Armagnac. Exceptional." 98 pts Luis Gutierrez The Wine Advocate (Aug 2013 review)