Late war type.
"Mirror reverse" variation of Japanese Submariner Badge
Japanese Submariner Badge of Volunteer Sailor Hayashi Hitsujisaru
Inscribed 呉志水 for 呉 - Kure 志 - Volunteer 水 - Sailor 四二四二一 - [personal number] 42421 林坤尺 - Hayashi Hitsujisaru Original case.
asiamedals.info
Another example.
Size 67 x 55 mm.
Weight 25 g.
Size 67 x 55 mm.
Weight 25 g.