Jupiter 3 1.5 / 50mm

Jupiter 3 1.5 / 50mm bought on eBay on june 6th, 2007 for 70$

I didn't know it before my wanders on Internet; some sites say it is an excellent lens.
It is a Carl Zeiss Jena Sonnar, the first items were called ZK (Zonnar Krasnogorsky) 1.5/50 and were made with parts taken while moving the factory from Jena.
The red "п" is the equivalent to the "T" of Carl Zeiss and shows that the lenses are coated (not multi-coated, that, it is shown by T*).It dissapeared on more recent models, every lens being coated.