Several stamps are known.
1st stamp variation.
Obverse
秩父宮殿下御閲團 - Corps Imperial Review by Prince Chichibu
記念章 - Commemorarive Badge
reverse
昭和九年五月十七日 - May 17, 1934
東京市聯合防護團 - Tokyo City Air Defense Corp Union (Alliance, Confederacy)
Another example of 1st variation badge.
1934 tokyo city combined air defense corp badge
air defense
air defense maneuvers badges
imperialreviewbyprincechichibubadge
japanese air defense badge
japanese badge
大日本帝国陸軍東京市連合防護團秩父宮殿下御閲團記念章
東京市聯合防護團秩父宮殿下御閲團記念章
陸軍東京市連合防護團記念章