I have 5 of these tubes with sockets. The sockets appear to have been desoldered from a board, and I have no info on the state of the tubes, other than they strike as they should. I've tested at least one segment of each one.
These are listed in Nationals literature as "Super" (.808" char) long life.
I will ship these double boxed in continental US for $120
If I'm way out of line on price and/or if you would like pictures, please let me know.
John