RARE Heintz & Kaufman Tube JAN-CKH-250TH VT-220. Shipped with USPS First Class Package.

I purchased this tube from a World War II veteran and local ham radio operator this box was found unopened I had no idea what was inside it until I opened it I think this too goes to a US Army or US Navy radio of some kind probably on a submarine but I do not know the exact history selling it as new old stock unused and tested the box was completely sealed up before I opened it. Please review the pictures as they are your description and condition. I will carefully pack and ship this entire box as found inside of another box.