Nice !! Possibly bakelite !! You can check by using 409 household cleaner on a Q-Tip,, rub a spot and see if the Q-Tip stains a yellowish color !! Can be a pale color to almost a nicotine brown !! Then wash it off and dry the spot !! Don`t have the Q-Tip dripping,, just wet it and squeeze the excess out before rubbing !! Try the very bottom of the handle since it would be the least touched !!