WHAT DOES THE MACALLAN 21 YEARS OLD TRIPLE CASK MATURED FINE OAK (750 ML) MEAN?

This bottle is getting offered by a customer who has appointed Mark Littler LTD to act as their agent. The seller is not really a VAT registered small business and there's no VAT included in the purchase selling price neither is there any VAT to pay.In the slow winter times, Reid would ferment and distill his excessive grains into whisky, which was