From Team Fortress Wiki
The Dueler is a headwear item for all classes that is awarded the following day to the player with the most duel wins in a given day. It is an oversized top hat large enough to cover the top half of the player's head, giving off a team-colored glow. The hat has eight large-caliber bullets stored around the band, encompassing the entire hat. One of the most prominent features of the Dueler is the large bullet hole which passes through the diameter of the cylinder. The hole immediately above the face appears to have breached outward, setting off the bullet in the immediate front.
Possession of the hat is not permanent and is limited to the player with the most duel wins in a given 24-hour period. This potentially allows the same player to possess the hat multiple days in a row if the player can maintain the most duel wins. Paint, custom descriptions and custom names on this hat will carry over to the next owner.
- The Dueler was added to the game.