This staff looks like a 2H blunt weapon. However you do swing it with the main hand and can still have a shield or something like that in the off-hand. BUT: Using this weapon will take use of your hand-to-hand skill and not the 1H blunt skill. (Thus 1HB not listed on the weapon.)
The weapon can be equiped and used (as a h2h weapon) at level 1 but the clicky doesn't work before lv 50.