Years
Model
Prefix letters
Serial Number Series
McCormick Deering W-4
1940
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
501 - 942
1941
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
943 - 4055
1942
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
4056 - 5692
1943
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
5693 - 7592
1944
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
7593 - 11170
1945
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
11171 - 13933
1946
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
13934 - 16021
1947
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
16022 - 18879
1948
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
18880 - 21911
1949
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
21912 - 24469
1950
McCormick Deering W4, O4, OS4, I4
WBH, OBH, OBHS, IBH
24470 - 28166
1951
McCormick Deering W4, O4, OS4, I4
WBH
28167 - 31213
1952
McCormick Deering W4, O4, OS4, I4
WBH
31214 - 33066
1953
McCormick Deering W4, O4, OS4, I4
WBH
33067 - --