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One tube, circa 1954, USA made by Sylvania/Philco for US Air Force,
military qualified type USAF-6189 / 12AU7WA vacuum tube
as pictured.
<<<<< As pictured = What You See is What You Get. >>>>>

A little Note for you:
This tube was manufactured by two very long time (decades) business partners - Philco and Sylvania in their tube manufacturing plant in Lansdale, PA.

Silk-Screening:
nil, please see photos

Acid Etched Designations:
please see the 1st photo

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Tube features 17mm-long-metallic black-ribbed plates and a 'Horse-shoe' shape (please see last two photos) getter on top.

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Hickok TV-7B/U* tested

Test Result(s)
    Tube#1    95/88              

minimum (65% of NEW) recommended for a good tube
56 / 56

(Triode#1 / Triode#2) 

*Hickok TV-7B/U is a mutual conductance(Gm) type tube tester. It does check for mutual conductance and the result displays in percentage quality instead.

Satisfaction Guaranteed!
*FantasticTubes !!!
🎷 🎶