More information relating to Sam Stevens' question: "... a benelux star five speed (13-14-15-16-17 Teeth) and am trying to find out the date these came on the market ..."
The Holdsworthy "Bike-Riders Aids" catalogues list a Benelux Star freewheel in the 1963-1965 catalogues. It does not appear in the 1962 and 1966 catalogues.
Peter Brueggeman
La Jolla California USA
4peebee(at)peterbrueggeman.com