Japan, Empire. An Imperial Army Enlisted Man’s Field Hat certificate_of_authenticity height of the badge is

height of the badge is 57mm

Manufactured by Kohler & Son

in honour of 30 years of naval aviation

the author of "Belt Buckles & Brocades of the Third Reich

43 mm in diameter to be worn on the standard service uniform

Japan, Empire. An Imperial Army Enlisted Man’s Field Hat certificate_of_authenticity height of the badge isAn Imperial Japanese Army field hat constructed of coarse olive drab wool field cap with most of the machine sewn yellow star worn off the front, the leather chinstrap is secured by two brass buttons, there are three ventilation holes on each side of the cap, the rear of the cap has two parallel rows of three reinforced openings which a cotton lace passes through for size adjustment, the interior is lined with cheesecloth, stamped with illegible