Orion 15 6.0 / 28mm

Orion 15 6.0 / 28mm second-hand bought for 350f on november20th, 1980.

Towards the end of 1980, I vas at a camera seller's, the main french specialist for soviet cameras and lenses (Muller, 21 rue des Plantes, Paris). I wanted to know what lenses existed for my Zorki. I was told: "the 35mm, the 85mm and the 135mm"; "O.K. but what about the 28mm position of the Zorki universal viewfinder?"; "yes, there is also a 28mm, and even a 20mm, but these ones are totally impossible to find".
I remember it very clearly because I found this 28mm lens the next week! (and the 20mm lens four years later). Nowadays, it is possible to find them on eBay.
This item has a fantastic look, with it's front and back lenses very convex.