The pump head that you show is an optional Campy part. Silca Impero pumps were sold without heads, and you could buy either the stock Silca head or more expensive Campy parts. Campy actually made two heads, a cheaper plastic part and the more expensive metal part shown in your photo. If you don't care about having a Campy, head you can buy a perfectly good much cheaper Silca part >>>>>> http://cgi.ebay.com/SILCA-Pump-Head-...3286.m20.l1116

All my plastic Silca Impero frame pumps have long since broken, and I've changed to Zefal HP pumps, which are all metal and have clamp on heads >>>> http://www.yellowjersey.org/hpx.html