As far as I know there are only two worm and wheel ratios for F and N tractors
The picture shows a slow and a fast worm, the easiest way to tell these apart is that the slow one (left) has less starts to the screw, three I think and the fast one has four
F/N worm ratios
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F/N worm ratios
1945 Ransomes MG2, 1950 P6 E27N, 1963 NP Super Major