6P15P - matched tubes, same factory and different dates - Yoshimitsu

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6P15P - matched tubes, same factory and different dates

Hi
I was looking for some 6P15P tubes from the Orzep factory. I found a matched quartet that measure the same but are from different dates. Can they be paired with each other?
If I am reading it correctly they are from 1980, 1991, 1977, 1982.
https://imgur.com/a/Nz5Ge1X

Edits: 05/11/22

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Topic - 6P15P - matched tubes, same factory and different dates - Yoshimitsu 07:19:04 05/11/22 (4)

RE: 6P15P - matched tubes, same factory and different dates - Spantou 14:03:20 05/11/22 (2)

RE: 6P15P - matched tubes, same factory and different dates - Yoshimitsu 08:38:06 05/12/22 (1)

RE: 6P15P - matched tubes, same factory and different dates - Spantou 11:52:09 05/12/22 (0)

RE: 6P15P - matched tubes, same factory and different dates - 6bq5 11:47:43 05/11/22 (0)

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