One rare new-old-stock military CV1947 (KT66/VT75/6L6G), made in the UK. This massively overbuilt tube has charcoal black plates and a single inverted cup getter. 

The date code on the tube is "AG" which means that it was made in July, 1945.

The tube was tested on a TV-7 D/U using 6L6G settings. Where the minimum for a good 6L6G is 25 (65%), and new ones usually test at around 40, this tube tested new at  46/25, confirming that it is new old stock.

Questions welcome, and more photos can be sent upon request. 

Worldwide shipping by Speedpost (express service) US$40. Depending on location and postal service used, shipping could be lower – please ask.