The Khamsin was part of Campagnolo's Fluid-Dynamic wheel line.  These disc wheels first appeared in 1986 and through 1987, they were offered in 600/650 & 700c.  However, by 1988, the 24" front disc had been dropped.  Interestingly, the 700c rear disc was offered as a standard road wheel as well as a road & track version.  The later used a special hub that could be converted by changing the axle.  One side of the hub was threaded for freewheels while the other side had a thread on which the track cog with its inverse thread lockout could be fitted.  A cover for the thread not in use was provided.  Below I have listed the weight and spacing for the 650c & 700c wheels according to the 1988 Campagnolo catalog. 

650c (front): 950g / 100mm

700c (rear road): 1090g / 126.5mm

700c (road & track) 1110g / 126.6/120mm