1 tube 5z3 Arcturus blue glass
engraved black base
black ribbed plate
hanging filament
test low on tube tester Hickok TV7 = 36 & 36 (reference good at 40 & 40 )
tested also on tube tester Funke W19S = 75mA & 75mA (reference good at 80mA & 80mA)
sold as test low as per test value results