5Y4G National Union NOS 1950 era (51/40 and 58/40)

5Y4G National Union NOS 1950 era small section of getter flaked off glass

51/40

58/40

(5Y4G/GT=5Y3GT with pin-out scrambled)

for:
- Zenith 5S-250 1938
- Zenith 10S669 1942
- Philco 38-4 radio 1938
- Philco 37-650 1937
- Philco 38-62 1938