Richard Binder writes about the “new” Duofold: After retiring the Streamlined Duofold from its catalog in 1935 (but continuing manufacture in the U.S.A. at least into 1937), Parker reintroduced the Duofold name in 1939. In 1940, the “striped” Duofold was introduced... [Read more here]
I have a green and gold model (beautifully translucent), a Striped Duofold Major with a Fine nib, vacumatic fill, manufactured in 1943 (identified by the wide band on cap & no tassie on the blind cap). There's a "V" engraved on the nib for "Victory" since this was made during World War II. Another fine writing instrument and a part of history.