I recently saw a bat with w154 stamped into the knob. I know Williams used a w155 and even a w153, but no record of w154. Is the w154 a Williams creation that he just never ordered or is it some other players model? Also, what is the barrel size of the o1? Would it be possible for someone to explain the progression and different specifications of his main models from the o1-w148-w155-w166-w183? Thank you