current owner doesn't even know what tractor he owns or is selling.
600 series was 55-57 model years. 601 series was 58-62 model years.
your model number says it is a 641
601 = 134ci gasser ( unless it secified diesel or lp.. etc )
x4x 4 spd trans non live pto, single plate clutch
yer sn says it is a early 62. 155--- was about the start of 62
don't feel bad. i'd take a 62 ofer a 56 any day. newer.. if condition was the same.. etc.