Douglas Laing Port Ellen Premier Barrel 24 Year Old Single Malt Whisky
We did a bit of research for you and found out directly from Douglas Laing that your particular Port Ellen 24 was a bottling in Premier Barrel livery specifically for NATEX...the NATO air-base in Germany. It was arranged through Douglas Laing's German Duty Free agent and sold well -- as Port Ellen is always an eye and palate catcher.
We've been told a retail price on the base of about GBP 120 per decanter - although this cannot be exactly sure as different shops work on different margins which of course may fluctuate the value a bit.
If you'd like an evaluation, we suggest you contact Martin at Mctear's - his email is: martin.green (AT) mctears.co.uk. Be sure to have excellent photos of your bottle to send him.
Hope this helps!