Test CRT Numbers ?

[EdKozk2]

Hello,
Last weekend at the WARCI , Milwaukee swap meet I saw this crt in the rear of a seller's van. It had no numbers on it, but the tube basing caught my attention. I took a chance and paid him three dollars for it. Tom C. was at the meet with his CRT tester, so he later tested it for me. I think the crt is a 5AXP4. Does anyone know if there were any other crt's that were made this size? I tested the tube in an Admiral 20X1 chassis I just finished recapping. This test crt will make it easier for me to work on the old RCA's where the crt is installed from the front. I have about 5 more to recap yet.
Ed