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