Tested Matched Pair of Gold Seal X-201-A (01A) Tubes.
Closely matched 01A tubes with engraved bases, globe/balloon envelopes and bare bullseye base bottoms which indicate that these are both early versions of Gold Seal's 01A instead of the typical licensing statement seen on later tubes.
Both labels are original and still intact with little to no wear.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
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