Vintage Western Electric KS-7340 Relay Set Wheelock Standards Mfg. by Signal Engineering and Mfg. Co., New York, NY dated Jan. 16, 1942.  Type - T-100, 90 Volts, 20 Cycles.  On the outside in front it says "Tel. Circuit Only".  Box measures about 7 1/2" x 6 1/2" x 2 3/4".  The outside of the box has some scratches on it, but the inside looks to be nice and clean.