The 10S153 was one of Zenith's higher mid-range sets for 1937.  It featured target tuning, which was a precursor to the tuning eye that used the shadow of a metal rod to indicate signal strength.  When the shadow moved up to the center of the bullseye, the station was tuned in.  It also had weighted tuning, a multi-position tone control, backlit black dial, and 3 bands.  This radio uses push-pull 6L6 tubes for audio output.  Mine was missing the grill bars, and the cabinet was in very poor condition.  I refinished it and replaced the grill bars- not totally original, but I did not think it looks bad.