No shorts, gas grid leakages or microphonics.
Both tubes tested Strong NOS (110%+ mutual conductance) on a Mercury 2000 tube tester with the following result (both in mutual conductance in uMhos and in percentage of the nominal value):
Tube 1: 17,500/18,200 (140%/146%)
Tube 2: 19,000/19,000 (152%/152%)
Good tubes start at 7000 and new tubes (incl. NOS/NIB) 12,500 - 13,000, and the Mercury 2000's rated mutual conductance (nominal) for new tubes is 12,500. 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 the numbers the better.
Appearance & Cosmetic condition
Despite some loss of paint on one of the tubes, this pair overall is in great cosmetic condition. The 3-line Munich date codes etched on the glass are visible on both tubes although you may need to look closer to see them completely:
Tube 1: N5 7I (N5 = E288CC 5th gen, 7 = 1967 or Rev. 7, I = September)
Tube 2: N5 8D (N5 = E288CC 5th gen, 8 = 1968 or Rev. 8, D = April)