World War I aviator-turned-cartoonist (1891-1969) known for his comic strip Ace Drummond. Original vintage sketch of a zooming biplane fighter aircraft by Clayton Knight, accomplished in ink and colored pencil on an off-white 5.5 x 3 card, signed by the artist who adds an inscription above, "To Olavi S. Mackey." In fine condition, with light soiling.
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