Can anyone tell me more about this 50th Anniversary of Philly medal I picked up at FUN?

This walked in off the street at the FUN show. Glenn (PonyExpress8) bought it, and I gave him a quick $5 profit on it because I really liked the obverse. Can anyone tell me more about it? I think it might be made of tin? Anyone know how many were made?

Thanks guys!
-Paul

Thanks guys!
-Paul
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Comments
In honor of the memory of Cpl. Michael E. Thompson
Edit: Independent, not International.
-Paul
<< <i>I don't believe it is the 50th anniversary of Philadelphia since the medal is dated 1869 and the city was quite a bit older than fifty years old at that time. >>
I wondered about that ...Philadelphia was founded on October 27, 1682
<< <i>IOOF is the International Order of the Odd Fellows.
-Paul >>
Weird. Is that some kind of cult? Lol
-Paul
<< <i>IOOF is the International Order of the Odd Fellows.
-Paul >>
for real. IOOF
Edited to add: Anyone have a Worthpoint account that can see what this sold for?
-Paul