Badges were manufactured by several workshops. One of these workshops was Kobayashi Medal Works https://asiamedals.info/threads/badges-and-watch-fobs-of-kobayashi-medal-mfg-co-ltd-medaru.22413/
1st type "flat reverse" badges.
1940 early badge in pure silver.
Marked 純銀 - pure silver...
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小銃射撃適任章