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International Harvester Tractor Serial Number Table- [better] Jun 2026

On older models (like the Letter Series), the serial number is often stamped directly into a boss (a flat, raised surface) on the engine block, typically on the left side near the carburetor or magneto.

While you can find hundreds of serial number tables on forums like RedPower Magazine or Yesterday’s Tractors , beware of inaccuracies. Many online tables are user-submitted and contain typos.

This format typically appears as a long string of characters (e.g., 2590009U004452 ):

On older models (like the Letter Series), the serial number is often stamped directly into a boss (a flat, raised surface) on the engine block, typically on the left side near the carburetor or magneto.

While you can find hundreds of serial number tables on forums like RedPower Magazine or Yesterday’s Tractors , beware of inaccuracies. Many online tables are user-submitted and contain typos.

This format typically appears as a long string of characters (e.g., 2590009U004452 ):