Stunning condition V5 summicron 
Rare silver edition that pre-dates the 6-bit coded Version 5 lenses. This special edition is machined precisely from solid brass so is slightly heftier than the black V5 lens. 
Optically it is excellent with no fungus/haze/dust visible in natural light, with very few dust specs visible when shining a torch through the optical barrel. 
Focus throw is around 90 degrees and is buttery smooth, and the aperture clicks are distinct and in half stops. There are no contaminants on the aperture blades. 
The built-in lens hood extends and retracts as it should. 
Included is the lens, original front cap, and generic rear cap.