Proof Number: 83.4 Macallan Malt Whisky of Speyside Proprietors Priest & Davidson The Macallan 1841 Replica. Filling whisky into glass was still uncommon in the 1850s, and The Macallan 1841 is one of the oldest surviving whisky bottles in existence. The bottles were free-blown, and may be identified by a slight swelling around the base, caused by the glass 'sagging' while it cooled. The glass was always very dark green or brown, owing to particles of iron in the sand used in their manufacture. Unlike wine, whisky does not deteriorate in a well-sealed bottle, and such changes as do take place are small and subtle, so long as the bottle is properly stored. So the contents of sealed bottles are more or less the same today as when the bottle was filled. The temptation to find out what The Macallan tasted like 150 years ago, bearing in mind that the 1841 will have been matured for eight to ten years, was irresistible. The original 1841 was nosed and tasted by The Macallan's Whisky Maker, Bob Dalgarno, and his team.