The Driggs-Schroeder Mark IX 37mm cannon, developed in the late 19th century, was a competitor to Hotchkiss designs and used by the US Navy for torpedo boat defense. It features a unique rolling-block-like breech mechanism and a recoiling barrel assembly. Weighing only 79 lbs, this lighter version was classified as an antique under US law due to its 1897 manufacture date.
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