[Mondial]

V5E is the RCA date code of the tube which indicates it was made in the Fall of 1945. It should be stamped on the black bakelite base of the tube and is not the type number.. The type 80 marking would be stamped on the glass and is easily rubbed off. Sometimes you can see the number if it is faint by breathing on the glass to fog it up and then hold up to the light.

Here is a link to the official Philco service info:

https://philcoradio.com/library/download...l.%201.pdf

https://philcoradio.com/library/download...20217B.pdf