An Antique Gun

An Antique Gun is a -quality item.

Source
This item is a rare drop from Strong, Heavy and Sturdy Junkboxes.

Trivia
It is a reference to an episode of the TV show, in which an exceedingly rare and valuable antique firearm (a Lassiter) is the center of a planned heist. Judging by the value, the Lasitor is the cheap goblin knock-off.