M.S."Chichibu Maru" blue Commemorative cancel applied Oct. 11, 1933.Then on U.S. N.R.A. stamp a violet sea post cancel was applied Oct. 20. ( This ship was renamed Kamakura Maru & used as a transport during W W I I . It was sunk off Panay, Philippines, Apr. 28, 1943, by USS Gudgeon.  How many of these covers exist?

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