Explain this.

[Roddy Scott]

I dismantled the prototype Tesla Meets Edison as it had served its purpose as a test for the final clock and while removing the tubes I noticed that they all had penciled numbers written on the rear of the cathode casing. 

Any clues as to why a mass produced item would have hand annotation on it?

The tubes in question are ITT GNP-7AH.

[jb-electronics]

Perhaps the number stands for the person who assembled it? Jens

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