Very Interesting. The lower level platform was built along with the rest of the station in 1932, but it was only used from 1959 to 1981 for odd services like the Aqueduct Racetrack special fare trains, and for rush hour E trains for a period during the 1970s.
So basically the lower level was abandoned for 27 years already when it was built. I guess this is why the tiles look like the tiles from Liberty to Euclid. Were the tiles only installed around 1959?