3KP4 on the bay...
 

This tube is in an original RCA box, but the seller says there's no way to test it.
The # is 160648511231 and the tube is in Seymour Tn.
The opening bid is $99.99 with just under 10 days to go.

I don't know who the seller is and I have no connection or interest in this tube, just telling everyone about it in case you are interested.

Cliff