Expo 1970 Osaka: Apollo Medal

Ok, another mystery from my pile of inheritances. I suspect my great uncle actually went to the Expo and bought this-- he was a storyteller and a world traveler. Very fun to sit down with, back when I was young.

I can't find any references to this thing on the internet, anywhere. I did read a bunch about the 1970 Expo and found out that the Apollo exhibition was a big deal, including a rock just brought back from the moon!

I'm not looking necessarily for valuation, but I'd certainly like to know how and where to chat about it.

Is it rare? Common? Etc...

Thanks for any help on this!
Steve