Mugfist Knuckles

These brass knuckles are plated with cheap faux gold that wouldn't fool even the most casual observer. You gain a +1 bonus to attack rolls and damage rolls made with this magic weapon. When you score a Critical Hit against an enemy with this magic weapon, you gain GP equal to the creature's Challenge Rating (or level if it does not have a Challenge Rating). Creatures with a Challenge Rating less than 1 count as 0.

Push (Mastery): If you hit a creature with this weapon, you can push the creature up to 10 feet straight away from yourself if it is Large or smaller.

Light: A light weapon is small and easy to handle, making it ideal for use when fighting with two weapons.

Proficiency: simple, brass knuckles Source: Ben Huffman - Pugilist (Third Party)