901 gearbox, produced between 1965 and 1969 based on information I have:
series 901/02, 901/03 and 901/50:
1st 3,091; 2nd 1,888; 3rd 1,318; 4th 1,0; 5th 0,758; diff 4,4285
series 901/13:
1st 3,091; 2nd 1,888; 3rd 1,318; 4th 1,040; 5th 0,7931; diff 4,4285
901/02 had 130 HP engine, 901/03 110 to 160 HP, and 13 series had 140 HP
Hope I've helped
