Hi Bob Possibly I am the only other remaining listmember with an Echelon, though a few possibly past members have had them. Mine is an Echelon Spectra which is a racing, rather than sport-touring, frame. Photos here: http://www.flickr.com/photos/14665132@N06/sets/72157602485929038/
Earlier discussion on the CR list of Cherubim and Echelon is in the archives: http://search.bikelist.org/?SearchString=echelon&Scope=classicrendezvous http://search.bikelist.org/?SearchString=cherubim&Scope=classicrendezvous
I was under the impression that these frames date from the 80s, and the aerodynamic styled fork on my frame, and the similarities between yours and mine in terms of lugs and dropouts would seem to support this.
David Benson Auckland New Zealand