| Serial Numbers: | |||
| Location: In front of gear shift | |||
| 1939 B | INA | ||
| 1940 B | INA | ||
| 1941 B | INA | ||
| 1946 IB | 1001 to 1002 | ||
| 1947 IB | 1003 to 1009 | ||
| 1948 IB | 1010 to 1281 | ||
| 1949 IB | 1282 to 1555 | ||
| 1950 IB | 1556 to 1878 | ||
| 1951 IB | 1879 to 2218 | ||
| 1952 IB | 2219 to 2569 | ||
| 1953 IB | 2570 to 2847 | ||
| 1954 IB | 2848 to 3072 INA-Speculation based on known production quantity | ||
| 1955 IB | 3073 to 3307 INA-Speculation based on known production quantity | ||
| 1956 IB | 3308 to 3407 INA-Speculation based on known production quantity | ||
| 1957 IB | 3408 to 3482 INA-Speculation based on known production quantity | ||
| 1958 IB | 3483 to 3592 INA-Speculation based on known production quantity | ||
| Comments: | |||
| The first 260 IB tractors built in 1939 - 1941 had Model B serial numbers and had 116ci engines.
Production in 1946 started with Serial No. IB1001 and had 125ci engines | |||
| B | IB | |
| 1937 | 96 | -- |
| 1938 | 11,699 | -- |
| 1939 | 21,594 | 113 |
| 1940 | 16,119 | 70 |
| 1941 | 6,961 | 75 |
| 1942 | 4,619 | -- |
| 1943 | 1,001 | -- |
| 1944 | 4,678 | -- |
| 1945 | 2,024 | -- |
| 1946 | 1,107 | 2 |
| 1947 | 5,305 | 7 |
| 1948 | 7,608 | 272 |
| 1949 | 6,868 | 274 |
| 1950 | 7,186 | 323 |
| 1951 | 2,754 | 340 |
| 1952 | 1,906 | 351 |
| 1953 | 1,158 | 278 |
| 1954 | 314 | 225 |
| 1955 | 969 | 235 |
| 1956 | 380 | 100 |
| 1957 | 175 | 75 |
| 1958 | -- | 110 |
| Total | 104,521 | 2,850 |