Hi,
I think that looks like Doenitz's signature, but it should be in fact Yamamoto's signature, or that of Hiroyasu Fushimi (or other commanders of IJN). If you can find out the equivalent of Admiral Doenitz in the Japanese Navy, (the submarine chief) I buy you a drink.. i dont know who he is
Yamamoto ~ 山本 Hiroyasu Fushimi ~ 伏見博康
