Years	Model	Prefix letters	Serial Number Series
Farmall Regular
1924	Regular	QC	501 - 700
1925	Regular	QC	701 - 1538
1926	Regular	QC	1539 - 5968*
1927	Regular	T	5969 - 15470
1928	Regular	T	15471 - 40369
1929	Regular	T	40370 - 75690
1930	Regular	T	75691 - 117783
1930	Regular (Modified Tractor)	IT	501 - 696
1931	Regular	T	117784 - 131871
1932	Regular	T	131872 - 134954