International Harvester Tractor Serial Number Table- Jun 2026

International Harvester typically stamped serial numbers into a riveted aluminum or brass ID plate. Over decades of farm use, these plates could be painted over, scratched, or lost. If the plate is missing, look for the numbers stamped directly into the cast iron frame near the original plate location.

Almost every major cast-iron part on an International Harvester tractor (engine block, axle housings, transmission cases) features a raised, cast-in date code. These codes consist of digits for the month and day, followed by a letter representing the year.

For example, a casting code reading breaks down as: 7: July (7th month) 14: 14th day R: The year code for 1948 IH Casting Code Year Reference Chart: A = 1931 I = (Skipped by IH to avoid confusion with the number 1) M = 1943 N = 1944 O = 1945 P = 1946 Q = 1947 R = 1948 S = 1949 T = 1950 W = 1953 X = 1954

If the plate is missing, look for dates cast directly into major metal components (transmission, engine block). They follow a Month-Day-Year Letter format. To find the year, add the letter's position in the alphabet to 1930 (e.g., A=1931 , I is skipped, J=1939 ). Serial Number Locations International Harvester Tractor Serial Number Table-

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If the original plate is missing, you may need to look for casting numbers on the engine block or transmission to narrow down the year, although this is less precise. Almost every major cast-iron part on an International

A tractor's model is typically clearly marked on its serial number plate.

If your serial number plate is entirely missing or unreadable, you can still determine the production year using IH casting codes.

number. For example, if 1955 starts at 501 and 1956 starts at 20,219, a tractor with serial #15,000 was built in 1955. Example: International Cub Serial Number Table They follow a Month-Day-Year Letter format

: It allows owners to verify if a tractor was built in a specific "model year," which often begins in the fall rather than on January 1st.

On the top of the transmission case, left side, near the seat.

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| Model | Serial Range | Year Example | |-------|-------------|---------------| | Farmall 460 | 501 – 36970 | 1958-1963 | | Farmall 560 | 501 – 54278 | 1958-1963 | | Farmall 660 | 501 – 5627 | 1959-1963 | | International 606 (utility) | 501 – 24134 | 1961-1967 |