John Wesley Hardin's Rosewood Grip Pistol

Origin
John Wesley Hardin (1853 – 1895) was an American Old West outlaw, gunfighter and controversial folk icon. Pursued by lawmen for most of his life, he was sentenced to twenty five years in prison for murder in 1877. When sentenced Hardin claimed to have killed forty two men, the newspaper however reported only twenty seven. In prison he studied law, wrote a biased autobiography and was released in 1894. One of the stories in his autobiography was that he shot his friend Charles Couger for snoring. Couger died a week later from a bullet wound but no one could confirm or deny that it was Hardin who had shot the man.

Effects
Those shot by it won't die for one week then drop dead. Even if the wound is superficial (such as shot in the leg) the victim dies from the wound after a week.

Trivia
Inspiration for [One Night at Mercy] (2003) Season 1/ Episode 2 of the 2003 Twilight Zone reboot. As seen here: Twilight Zone Artifacts