The code name for the Kawanishi E7K was Alf. This aircraft was already obsolescent by the outbreak of the war, but remained in use in various roles. It had been developed in the mid 1930s in competition with Aichi and was accepted by the Japanese Navy in 1934. By 1939 it had, as the E7K2, a better engine in the 870-hp Mitsubishi Zuisei 11 14-cylinder radial piston engine. The three-man craft cruised at 115 mph at 3,280 feet and had an endurance of 11 hours, 15 minutes. The reconnaissance work for the First Air Fleet was carried out by Aichi E13A Jake floatplanes.
You can find out more about the Alf in the following Osprey books: