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Help with Mullard CV4004 Date code

How do I figure out the exact year of manufacture for a Mullard CV4004 with box plates that has the following on it?

on one side near the bottom of the tube:
I don't know what 641 means but I think the second line means Mitcham UK, 1963 or 73 or 83, November, 3rd Week. Also these alphanumerics don't rub or scrape off.

On the otherside of the tube in white paint that I can scrape off:

Finally, there's an H etched into the very bottom of the tube where the pins stick out. It's right in the center of the circle formed by the pins.

Thank very much for your help.



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Topic - Help with Mullard CV4004 Date code - oldngrumpy 14:38:49 03/04/17 (5)


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