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@Vince
Most of these had a 'standard' british threaded headset so you should be ok to replace it. My money is on BSA and not french.
The TPI should be stamped somewhere on the headset when you pull it apart.
BSA = 1" x 24 tpi (25.4 x 1.058 mm)
French = 25 mm x 1.0 mm
The crown race also differs if the forks are actually french (http://sheldonbrown.com/velos.html)
Here is a link to mine which is a Mirage Pro in Columbus Aelle (forks are still Cro-Mo):
http://www.lfgss.com/thread81615.html