J.P.K.S.

Is it supposed to turn both ways? I know that in more traditional divers that require you to manually rotate the tachymeter, it only goes one way. In my new diver, the tachymeter turns both ways, and one way is "faster" than the other (i.e. for one way, the tachymeter movement is constant and occurs every full turn of the upper left "crown", but for the other way, the movement is sporadic and sometimes only occurs with multiple full turns of the "crown" in the other direction). Is this normal? Thanks in advance. By the way, why is k-n-o-b censored?