A world power conference was held in Tokyo from October 29 until November 7, 1929.
Badges were manufactured by Ando workshop in Tokyo.
1st variation (safety pin).
No.448
Size 36,9 mm.
Obverse
昭和四年 - 1929
世界動力會議東京部會 - World Power Conference Tokyo Subcommittee/Group
Ribbon
世界動力會議 - World...