I don't think that is a Campagnolo SR rear derailleur but a black SunTour Cyclone. My first thought was black Shimano Crane but it appears to have a slant parallelogram. Also, the brakeset is first generation Dura-Ace. I thought the shift levers might be Dura-Ace too, as the first Kleins with brazed-on shift lever bosses used the Shimano bosses and Dura-Ace levers but these do appear to be Campagnolo Record. Also was surprised to see Campagnolo (36H hubs no less), knowing that slightly later versions used Hi-E.