International Harvester Tractor Serial Number Table- May 2026

For enthusiasts and collectors, the International Harvester (IH) tractor serial number table is more than just a list of digits; it is the definitive roadmap for preserving agricultural history. These tables serve as the primary tool for identifying a tractor's exact year of manufacture, production sequence, and original factory configuration. The Importance of Serial Identification

Letter Series (A, B, C): Typically found on a metal tag on the left or right side of the seat support. International Harvester Tractor Serial Number Table-

International Harvester Serial Number Ranges by Model

| Model | Year Range | Serial Number Start | Serial Number End | |-------|------------|---------------------|-------------------| | Farmall Cub | 1947–1964 | 501 | 224,703 | | Farmall A / AV | 1939–1947 | 501 | 125,675 | | Farmall B / BN | 1939–1947 | 501 | 126,382 | | Farmall C / Super C | 1948–1954 | 501 | 158,660 | | Farmall H / Super H | 1939–1954 | 501 | 395,247 | | Farmall M / Super M | 1939–1954 | 501 | 229,093 | | Farmall 100 | 1954–1956 | 501 | 42,369 | | Farmall 130 | 1956–1958 | 501 | 20,305 | | Farmall 200 | 1954–1956 | 501 | 33,257 | | Farmall 230 | 1956–1958 | 501 | 15,140 | | Farmall 300 (Utility) | 1954–1956 | 501 | 43,345 | | Farmall 350 (Utility) | 1956–1958 | 501 | 13,514 | | Farmall 400 | 1954–1956 | 501 | 32,446 | | Farmall 450 | 1956–1958 | 501 | 16,875 | | International 404 | 1961–1965 | 501 | 23,150 | | International 504 (Utility) | 1961–1967 | 501 | 16,728 | | International 606 | 1963–1967 | 501 | 23,423 | | International 706 / 756 | 1963–1971 | 501 | 80,000+ | | International 806 / 856 | 1963–1971 | 501 | 45,000+ | | International 1066 | 1971–1976 | 501 | 30,105 | | International 1466 | 1971–1976 | 501 | 17,146 | | International 1566 | 1974–1976 | 501 | 8,731 | | International 86 Series (1086, 1486, 1586) | 1976–1981 | 501 | Varies by submodel | Engine Casting Codes: Look for a small raised

Example Logic: If the table says 1947 – 501 and 1948 – 25001, a tractor with serial number 15000 was built in 1947. locate your serial number

3. Serial Number Tables by Model Family

A. Letter Series (1939–1954) – Most Collectible

| Model | Serial Number Start | Serial Number End | Year | |-------|--------------------|------------------|------| | Farmall A | 501 | 50109 | 1939 | | Farmall A | 50110 | 78434 | 1940-1947 | | Farmall B | 501 | 130838 | 1939-1947 | | Farmall BN | 501 | 16211 | 1940-1947 | | Farmall C | 43901 | 128650 | 1948-1951 | | Farmall Super C | 128651 | 170959 | 1951-1954 | | Farmall H | 501 | 40000 | 1939 | | Farmall H | 40001 | 390000+ | 1940-1953 | | Farmall M | 501 | 40000 | 1939 | | Farmall M | 40001 | 275000+ | 1940-1952 | | Farmall Super M | 275001 | 294000+ | 1952-1954 |

Common Reference Sources (recommended)

Published serial-number guides and model histories from reputable authors (tractor historians and registries).
Manufacturer parts books and operator manuals (often reprinted by tractor clubs).
Tractor clubs and registries (e.g., Farmall/International chapters) — they maintain detailed serial lists.
Museum archives and official factory production logs (where accessible).

Engine Casting Codes: Look for a small raised number near the oil filter or distributor (e.g., 10-15-M = October 15th, 1950s). Cross-check this with the tractor serial table.
Lug Bolt Pattern: Early Farmall H used 7-lug rims; later models used 8-lug. The serial number table helps confirm the transition years.
Grille Style: The 56 series (756, 856) had a flat grille in early 1968, and a curved grille after S/N 13,000.

How to Use the Serial Number Table (Step-by-Step)

Let’s walk through a practical example. You find a rusted Farmall H in a ravine.

This article provides a deep dive into how to read these tables, locate your serial number, and decode the history hidden in those digits.