In the late 1930s, many watch manufacturers made "pilots watches" in support of, what was at the time, the trendy market for anything related to airplanes. Laco, Helvetia and others produced chrome (sometimes steel) cases with black dials featuring high-contrast large luminous numerals and large lumed hands, presumably for good visibility in the cockpit. These watches were often quite large (40-44mm in diameter or larger), but small diameter watches that followed the pilot watch style were also produced.
Laco is still in production today, and is still producing pilots watches.
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