When Tom Horn broke out of jail, he grabbed a handgun from Under-Sheriff Dick Proctor and made his getaway. He was quickly recaptured when he was unable to get that handgun to shoot.
What kind of handgun was it?
(Depending on the source, I have found a basic generic description all the way to full nomenclature, to include serial number. I'm curious to see what some of you may be able to come up with.)