I’ve found this tube from an eBay seller called “LCI electronics”. He’s from Bulgaria. This tube was made in ex DDR, German Democratic Republic, in late 80′ from the well known manufacturer of hi-tech electronic products “VEB Robotron”. This pictures are of the item that I’ve received.
As you can see, the product that I’ve received is the same of that listed. Excellent package indeed! The seller sent me a brief datasheet/comparison chart and and application example.