I spent 28 years looking for one! In the beginning, I often saw ones in the windows of second-hand camera sellers in Paris, but I had other priorities and a limited budget. Then, not any one for 25 years. Thank you eBay for allowing me to complete my shopping list!I received with it a set of soviet-made extension tubes in their bakelite box.
A newer version, in "A" mount. The optical part is the same.