Old Forester Signature 100 Proof doesnÕt actually say ÒSignatureÓ anywhere on its bottle. It gets its name in honors the legacy of founder George Garvin Brown, which features his signature on every bottle. Old Forester is the longest running bourbon brand on the market and was the first bourbon sold exclusively in sealed bottles. The brand is also noted as one of the few whiskeys that was allowed to be sold during Prohibition for medicinal purposes.