The 274 EIA code indicates that this tube was made by RCA for Sonora.
Black glass envelope with a black plate.
There is a hairline crack in the base located near the date code - see photo 4. This doesn't affect the performance in anyway and the base is still tight and secure with no looseness.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
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