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Keywords: Keystone PK-1 in flight.jpg A U S Navy Keystone PK-1 flying boat in flight Keystone Aircraft produced 18 Naval Aircraft Factory PN-12 under licence as PK-1s These aircraft served with patrol squadron VP-1F from 1932 to 1938 U S Navy Naval History Center Dictionary of American Naval Aviation Squadrons Volume 2 The History of VP VPB VP H and VP AM Squadrons http //www history navy mil/avh-vol2/appen1-2 pdf s 1930 USN PD-USGov-Military-Navy Keystone PK |