Years	Model	Prefix letters	Serial Number Series
Farmall F-12 & F-14
1932	F-12	FS	501 - 525
1933	F-12	FS	526 - 4880
1934	F-12	QC	4881 - 17410
1935	F-12	FS	17411 - 48659
1936	F-12	FS	48660 - 81836
1937	F-12	FS	81837 - 117517
1938	F-12	FS	117518 - 123942
1938	F-14	FS	124000 - 139606
1939	F-14	FS	139607 - 155401
1939	F-12 with F-14 Field Change	FS	155402 - 155902