Both tubes tested Strong NOS (110%+ nominal mutual conductance) and 100% balanced on a reliable and recently calibrated Mercury 2000 tube tester with the following result (mutual conductance both in uMhos and in percentage of nominal):
3,420/3,400 (114%/113%)
Good tubes start at 2000 and new tubes (incl. NOS/NIB) 3,000 - 3,100, and the Mercury 2000's rated mutual conductance (nominal) for new tubes is 3,000. Test result can also be seen in the pictures. In case you wonder what all these numbers mean to your sound experience, it's actually quite straightforward: mutual conductance directly translates to a tube's ability to amplify sound, so the higher these numbers the stronger. No short, leakage or gas.
Appearance & Cosmetic condition
Besides the world-class sound characteristics, we still treasure this pair for its near pristine cosmetic condition given the tubes' age - nearly 100% of the paint is still intact, and the French date code etched on glass is perfectly visible: FRS 68133 (FRS = France, 68 = 1968)