SV, Bigtwin, V-Twin, Flathead / Harley-Davidson Motor Company / Harley
- Serial numbers: ranged from 30SV1 to 40SV995.
- Harley Davidson Bigtwin: Serial numbers ranged from 36EL1 to 47EL4955 for the EL model and from 36UL1 to 47UL5585 for the UL model.
- Harley Davidson V-Twin: Serial numbers ranged from 32V1 to 48V18195.
- Harley Davidson Flathead: Serial numbers ranged from 30F1 to 48F10150
- Production year(s): 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958
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