Benmore distillery was built in 1868 by the big Glasgow blender,
Bulloch Lade.
The distillery then became part of Benmore Distilleries Company Ltd, also from Glasgow, and operated until 1927 when it closed for good.
The company also bought Lochindaal in Port Charlotte on Islay in 1920 and a year later added Dallas Dhu on Speyside.
Presumably the Benmore blend was created around this time and included malts from all three distilleries, though only Dallas Dhu was ever mentioned on the label.