Cool old Faygo sign found on a building in Detroit

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I drove past this building on Mt Elliot in Detroit the other day.  When they demolished the building next door it revealed an old sign for Faygo Pop that goes well back into the last century.

Here is the Faygo logo from the 1930's.  It changed in the 1940's.  I suppose its possible that the original painted sign goes back 70 years or more.  Most of the city does.