MOV date and location codes?

Tubes Asylum

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Just got some KTZ41 tubes, a 4v equivalent to a 6j7 on the obscure British 7 pin base. I know these are pretty old but there's a big, bold code on the side and I can't make heads not tails of it. Anyone have any info?
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Topic - MOV date and location codes? - isaacc7 21:03:36 04/03/23 (0)

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