It originally belonged to John de la Tour, the first Assassin in the New World, before being given to Connor after he became an Assassin, many years later. The Louisianan Assassin Aveline de Grandpré later obtained an Assassin Tomahawk, after having met Connor in 1777 to eliminate George Davidson, a member of Lord Dunmore's Ethiopian Regiment and a Templar.
If Connor equipped another weapon that replaced the Assassin Tomahawk, it would still appear in major File:Tomahawk connor.pngAssassin tomahawk rendercutscenes.
Furthermore, if Connor equipped another weapon that replaced the Assassin Tomahawk, it would not appear in the armory in the Davenport Manor's basement. Instead, he would need to retrieve it at a general store for no cost.
The Assassin Tomahawk could be obtained in Assassin's Creed III: Liberation by connecting to Assassin's Creed III, or by purchasing it for 20 Uplay points on Liberation HD.