It is not a font! AND ... those are real shadows! Also predates "fonts".
That
sign goes back to the days of room sized computers.What you have is a picture of a "blister" mag
sign!
They were EXPENSIVE! Produced by vacuum forming ABS sheets over pre formed letters, the "painted with a hard rubber roller and silk screen ink... them strips of magnetic were added around the edge!
Guaranteed to peel, chip, tear and/or fly off at anything over 10 mph!
That type of
sign died a miserable death when "allmag" sheets became available.