the Bookmatched twist patern indicatation on MvH damast means it was made up from 2 or more alternating directions of twisted bars with the same contant to create the bookmatched effect. twisted while it was a square bar with Straight or a variation like crushed M’s layers. grinding into the bar reveals its true identitie wich was hidden from the surface. the bar ends en rate of twist give you a heads up on whats ahead.