Years
Model
Prefix letters
Serial Number Series
McCormick Deering W-40 & WD-40
1935
McCormick Deering W-40 & WD-40
WAC, WKC, WDC
501 - 1440
1936
McCormick Deering W-40 & WD-40
WAC, WKC, WDC
1441 - 5119
1937
McCormick Deering W-40 & WD-40
WAC, WKC, WDC
5120 - 7664
1938
McCormick Deering W-40 & WD-40
WAC, WKC, WDC
7665 - 9755
1939
McCormick Deering W-40 & WD-40
WAC, WKC, WDC
9756 - 10322
1940
McCormick Deering W-40 & WD-40
WAC, WKC, WDC
10323 - 10559