Nuffield Farm tractors by year
The Nuffield tractor was developed by England's Morris Motors in reponse to a post-World War II need for farm machinery and export products. The M3 and M4 entered production in 1948. The line continued until 1969 when it was purchased by Leyland.
Nuffield history - article at YT Mag
| Model | Power | Years |
| M3 | 38 hp | 1948 - 1961 |
| M4 | 38 hp | 1948 - 1961 |
| DM-4 | 50 hp[B] | 1950 - 1961 |
| PM-4 | 40 hp | 1950 - 1957 |
| Universal 3 | 34 hp[P] | 1957 - 1961 |
| 3/42 | 42 hp | 1961 - 1963 |
| 4/60 | 60 hp | 1961 - 1963 |
| 10/42 | 43 hp[P] | 1964 - 1966 |
| 10/60 | 61 hp[P] | 1964 - 1967 |
| Mini 9/16 | 16 hp | 1965 - 1968 |
| 3/45 | 45 hp | 1967 - 1969 |
| 4/25 | 25 hp | 1967 - 1969 |
| 4/65 | 65 hp | 1967 - 1969 |
[B]: Engine power estimated from belt horsepower. [P]: Engine power estimated from PTO horsepower. See individual tractor data listing for power details.