Plates were manufactured by https://asiamedals.info/threads/history-labels-i-marks-of-hattori-watch-shop-tokyo.19361 in three different sizes (1st, 2nd and 3rd class of award).
1st class award plate has diameter approx. 22.5 mm.
2nd class award plate has diameter approx. 20.5 mm.
Diameter 22.5...
1939 navy proficiency test award plate
hattori watch shop
hattori workshop
imperial japan navy proficiency test award
japanese navy proficiency test award platekusunokimasashige
labels и marks of hattori watch shop
platewithkusunokimasashige
昭和十四年海軍検定褒賞皿