Dr Watson's revolver

“Watson,” said he, “I have some recollection that you go armed upon these excursions of ours.” (Sherlock Holmes)
I produced it from my hip-pocket, a short, handy, but very serviceable little weapon. He undid the catch, shook out the cartridges, and examined it with care.
“It’s heavy — remarkably heavy,” said he.
“Do you know, Watson,” said he, “I believe your revolver is going to have a very intimate connection with the mystery which we are investigating.” (Sherlock Holmes)