Meh, too much for me, considering how awesome Dalibor's RZ568M tubes are, at $150 each new.
Those 9020's were 50 years old and looked lightly used. I wonder how long they'd last. I haven't seen anything suggesting they're long life tubes. Over twice the cost of new tubes, due to their rarity.
Still, I'd love to have one to experiment with, but wouldn't really want to build a clock with them.
We have so many other awesome big tube clocks to choose from. :-)
PV's Spectrum kits, Dalibor's Zen clock, and of course, MB's ModSix!
Collect them all! LOL!