Oban 13 Year Old Manager's Dram 1990
The Manager’s Dram series of whiskies were bottled exclusively for employees of what is now known as Diageo. These whiskies were selected by the respective distillery managers within Diageo malt distilling and bottled at natural cask strength.
A 13 year old sherry matured Oban bottled in November 1990.
Although not stated appears to be a 75cl bottle.