Jan,
No doubt that Herse track bikes are VERY rare. I know of only two; one is here in my shop; property of Ted Kirkbride. I will finish the restoration before too long.
The bike may be a on-of-a-kind. It was displayed in the Rene Herse booth in the 1960 Paris bike show, the story goes. Dr. Clifford Graves saw it there and somehow it was purchased and ended up in the possesion of Ted Kirkbride way back then. Ted raced it here in CA and has been the owner of the bike since that time.
The most unusual feature of this frame is that it is fitted with headlugs that have the internal headset cups; somewhat like Bianchi, but actually much more graceful. The lugs are the standard "Rene Herse" style cut lugs otherwise. The fork crown is the typical sand cast twin plate looking track crown (22mm) but has been added to a bit to make a quite distinctive look. The frame is awsome as a track bike and nothing about this bike suggests that Rene Herse didn't have his heart in it or didn't know what he was doing. The clearances are very tight. The seat tube also has a "cinelli like" shim in it which yeilds a 25.0mm seat post diameter. Not quite sure why; possibly for use with an "expander" type seat post?
This is the coolest and most rare track bike I've ever handled. In my book this bike has major MOJO to spare! Yikes!
Brian Baylis La Mesa, CA Track bikes are good; Rene Herse track machines are GOODER!