Another unknown badge. ID?

[Wartime Collectables]

This Japanese collection has certainly been a great learning experience. The combat pieces and such were no problem. But I don't know the badges. Any help with an i.d. on this piece??

[GHP]

The reverse identifies it as a Showa 7 (1932) air defense exercise participation badge conducted in Osaka.

I don't know about authenticity, though.

--Guy

[Wartime Collectables]

The reverse identifies it as a Showa 7 (1932) air defense exercise participation badge conducted in Osaka.

I don't know about authenticity, though.

--Guy

Thank you!