Who was Capt. Jack ie 1858 Remington

[Mississippi]

Hey all,

  While working in North Western Nevada, passing through a town of 193, name of Montello, I stopped by the general store. There was an old revolver, covered in dust laying in a case. I looked at it, and I bought it.
 
  Turned out it is a IL Pietta, 2001 copy of the 1858 New Remington. I took it to a gunsmith in Wells, Nv to have it cleaned and checked out. The smithy flipped over this gun. He loves it, very impressed with it.

  But I need help with some identity issues. It is a .36 cal Black Powder, and in the grip is stamped 'CAPT. JACK'... I have tried to research through Pietta, the Internet, etc., as to WHO Capt. Jack is/was, but too many results and nothing exclusive.

  Who was THE Capt. Jack, who used an 1858 New Remington???

  Thanks,
   Mississippi