The "B0" designation is only found on Marlin 1895 rifles manufactured in 1972.
jackfish,
Just to be sure I have this right, do you mean to say that the Model 336's and the Model 39's made in 1972 used the serial no. prefix "72", and not "B0"? (Can I be annoying, or what?!) <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />
