What dram is in your quaich?

[mookien]

I believe that is a custom, one-off version of what used to be called a Vatted Malt, i.e. a blend of aged single malt whiskies, as opposed to a blend of single malts and unaged, neutral grain alcohol as a "filler". A combination of two very mature Islay malts--a noble experiment indeed......

I believe you are correct. You can still get "vatted malts", but you have to vat them yourself.

My "experiment" was exceedingly ad hoc and fortuitous. It was driven by a simple, primitive desire to drink a full glass of scotch and I didn't want to end up with just a "half-glass" solution. To me it actually tasted better than either bottling. Pure luck.