Vintage 1939 Golden Gate Exposition Aluminum Union Pacific Overland RR Coin

Description

This is a 1939 aluminum coin from the Golden Gate International Exposition (San Francisco, California).
It features the Golden Gate Bridge on one side.
The other side features the Union Pacific Overland Railroad shield and two trains (the Streamliner and the Challenger).
The coin is in good shape, especially considering its age.
It does, however, have a hole punched through.
Apparently at some point in time, someone wanted to wear it or secure it to something else.
The strike is sharp and clear and the coin is in need of a proper cleaning.