This is a NOS Western Electric / RCA 6L6G Triode.  Looks like it was made by RCA Radiotron for Western Electric.  See markings on the box.  Has original packing material.  This was just tested on a calibrated TV-7D/U.  The 6L6 should test at least 23.  This tube tested 44.  Excellent near mint condition for the tube.  Box is coming apart.