Bidspirit auction | WWII Imperial Japanese Army Officer

WWII Imperial Japanese Army Officer Visor Hat - Moth nip and tracked all over. Size is not given. But it has to be small. I was gonna look underneath the sweat band to check for markings. But it feels brittle. So I left it alone. I googled lens the diamond tag from inside the visor. Ryochu Yama/San Sho/Ko. Sho/ko means small. Leather chinstrap. Both Chrysanthemum side buttons are there. Well used example.