Japanese Government 50 sen note, Fuji-Sakura series, Japanese Numismatic Dealers Assn. catalog #11-60, issued from Showa 13 (1928) June 1 to Showa 28 (1943) August 31. JNDA Catalog value in that condition <¥200 (~#1.75).
Those are US Allied Occupation 10 and 50 Sen "B" NOTES. These notes were issued in 1945 and 1946 for use in Japan, Korea, and Okinawa by the United States Military occupation after World War ll.