1924 Series 10C was the first. Not sure when the OE-1 was replaced by the cast-iron Stromberg, but I'll guess that the Series 11 of 1927 was the last. The Series 12 of 1928 may also have used it.
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Steve Braverman
Aura Vincit
1932 Franklin Airman Series 16A Sedan (The Driver)
1933 Franklin Olympic Series 18A Convertible Coupe (The Project)
1932 Plymouth PA Sedan (The one with water in it)