Shinpachi-sama,
I truly admire Osaka people for keeping the engines at the museum. I wish to visit Osaka some day which must be a great fun. The last time I went to Osaka was in 1970 when the EXPO was held there.
Here is my only treasure; a shaft metal of the Navy Hi-Shiki (a license built Hispano by IJN, not IJA) which I bought at an auction at 500 yen few years ago. At the same auction a connecting rod assembly for the Hi-shiki engine was taken by another person at 25000 yen. I saw clearly there was an IJN recognition number stamped on the rod accompanied with an anchor marking. I firmly believe the auctioner but believe it (me) or not is everybody's liberty. Alongside is my handcrafted Mustang still stuck in this form.