Glenrothes 2015 Signatory #6 – Signatory Vintage Scotch is one of the most discerning independent bottlers of Scotch in the world. We bottle one cask at a time, capitalizing on the unique color and flavor characteristics of each individual cask. By sourcing all-natural malts from the best distilleries in Scotland. Selecting the best single batches and bottling only the finest casks within those batches.