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John, I think this makes your tube the latest known 15GP22, as the other 1959 tube that Pete references above is from week 26.
It's also interesting that this is now the 2nd '59 tube to show up and that no other tubes between '54 and '59 have surfaced to my knowledge. Unless this is purely coincidental, this makes it more plausible in my mind that Lancaster did a second run of these in '59 to replenish replacement stock. However, one would think they would have done so over a very quick timeframe (like a week or two), not 13 weeks. Or maybe they were intermittently reworking '54 tubes that had already gone to air while sitting in RCA stock? (However, I don't recall your tube showing signs of re-necking).
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