Garage/Shop find

[ksjh1316]

Sorry not a truck but I think it is pretty cool anyhow. My wifes grandfathers shop was a old auto repair shop from about the 20's thru the 70's when he bought it to work out of since it was across the street from his house. Fast forward to today when my father-in-law and I were up in the attic cleaning out some junk. We both think we were the first up there since the 70's found some pretty cool stuff but this was what I had to bring home to have as a end table in my den. Look at the filter chart that was attached under the flip up sides. Anyone have a quess as to the age of this or the time period these types of filters were used?

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