Signature, also known as McDowell's Signature, is a brand of Indian whisky, manufactured by United Spirits Ltd (USL), a subsidiary of Diageo. 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.