This is an Industar 61 L/D 53mm F2.8 for Leica thread mount rangefinders. The glass is in very good condition. The iris is oil-free. The mechanics are fine except for a slight uneven resistance in some parts of the focus travel (typical of these lenses). Makes very sharp, colorful images and is a real bargain in a photographic category devoid of bargains!
Price: $17 plus shipping