Signature, also known as McDowell’s Signature, is a brand of Indian whisky, manufactured by United Spirits Ltd (USL), a Diageo Group company. It was launched in 1994. Signature is a blend of imported Scotch whisky and locally produced products. Signature is sold in octagonal bottles which were designed by London-based design firm Claessens International, who also designed the packaging of the bottle. It is available in two variants – Signature Rare Aged and Signature Premier Grain. Signature was launched in 1994 by United Spirits Ltd, formerly known as McDowell Spirits Ltd. Signature was initially available in quarts (750 ml bottles). 180 ml and 375 ml sizes were introduced in October 1999. Initially launched in the super-premium segment of the Indian whisky market, Signature was lowered to the premium category in 2001. Signature began being sold in Canteen Stores Depot (CSD) for defence services in January 2002. Signature was launched in Tamil Nadu on 5 August 2004.