Badge was introduced on May 28, 1936 by Imperial Decree No. 78 /警察講習所教官服制・勅令第七八号/. It was worn on the right side of the tunic under the breast-pocket. Senior instructors were issued with gilded badges, while junior instructors with silvered badges.
1st variation made by Akbiba workshop...
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japanese police school badge
内務省
内務省制警察講習所教官徽章
昭和十一年制警察講習所教官徽章
警察講習所徽章
警察講習所章