PC on Mursaat Hammer

Hi,

Could I please have a PC on a Sundering Mursaat Hammer of Hammer Mastery
Max Dmg, Req 9, Armor Penetration 20% (20% Chance)
Hammer Mastery +1 (19% Chance)

Would the price alter much if the Hammer Mastery was 20% chance?

Thanks.

slavage no dmg mod.