Badge with similar design https://asiamedals.info/threads/judicial-protection-project-association-merit-badge-in-commemoration-of-2600th-anniversary-of-the-japanese-empire.25367/
Size 27 mm.
Obverse
皇紀弐千六百年 - 2600th Year of the Imperial Reign= 1940
祝典 - Celebration Ceremony
reverse...
2600thanniversarycabinetcommitteebadge2600thanniversary of the japanese empire
2600thanniversary of the japanese empire badgecabinet celebration committee member's badge
japanese badge
昭和15年内閣祝典委員徽章
皇紀弐千六百年祝典内閣祝典委員徽章
皇紀弐千六百年祝典章
皇紀弐千六百年章
紀元二千六百季祝典バッジ
紀元二千六百季祝典昭和15年11月内閣バッジ