See also https://asiamedals.info/threads/army-large-special-maneuvers-osaka-city-committee-members-badge.29093/
Reverse is marked 花十三 - Hana Jūzō [13 flowers] workshop.
Even with original case we still couldn't determine the place and year of the maneuvers.
陸軍特別大演習 - Army Large Special...
