are you sure it is a bottle of Single Malt?
There also exist several Vatted Malts and Blended Whiskies from the Speyside Distillery Company.
Speyside can be a Blended that can also be found with an age of 8, 12, 15, 17, 21, 25 and 30 years.
This Blend belongs to the ex-partner-company Campbell & Clark. After the takeover through Speyside Distillery Co. these Brand may be produced under the new proprietaryname.