I think this bottle either comes from the Speyside Distillery or has associations with its founder George Christie
The Speyside Distillery & Bonding Company Limited was founded in 1955 by the Christie family who were involved in other whisky ventures. In 1956 George Christie obtained a plot of land at Drumguish near Kingussie. In 1962 he commissioned the building of the distillery and in December 1990 the distillery become operational. Three years later George brought out a limited edition single malt as a ‘thank you’ to those involved in the building of Speyside.
However, and here comes an important piece in the jigsaw, during the period prior to the distillery becoming operational, George sold blends and vatted malts, some going under the name Speyside. I believe they didn’t bring out a single malt under the distillery’s name until 1999 and that was an 8yo, prior to that I thank it went under the title ‘Drumguish’
Another clue with your bottle’s link with the Speyside Distillery is the crest, which can be seen on their casks http://www.scotchwhisky.net/images/dist/drum_cask.jpg
and found on the distillery gates.
I would say this is a vatted malt, bottled during the period prior to the distillery opening. The term ‘Pure Malt’ was used for both single and vatted malts at one time but as a rule if the words appear on a bottle of scotch then it is usually a vatted malt.