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I'm afraid "C" indicates a used, tested tube, which was sold from a store at some point. The prefix letters "AA" = 100% new tube; "A" = used glass, but new phosphor and new gun (almost never seen on color tubes); "B" = a rebuilt tube (either new gun or re-cathoded) with used glass and phosphor); and "C" = a used tube.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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