I recently bought DLC 3 for Assassin's Creed Revelations and it included the Ottoman Doctor skin from the special edition. This mod adds the Ottoman doctor's knife from Assassin's Creed Revelations MP, the knife looks great in the game.
To make Cj have a knife, press "End", and to make it disappear, press "Delete".
Maybe I’ll convert the Ottoman doctor himself, but I can’t promise anything yet.