This Sylvania 5U4G rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts, gas and emissions. There were no shorts or gas.
It measured 56/52 where minimum (65%) is 40/40 and 100% is 62/62.
This tube has 439 C date codes, a bottom, D getter and nice flashing. There is some cathode coating that has shed from the filaments. Please see picture.