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@Scilly.Suffolk
a) These were originally threadless and a thread has been cut.
I can't find any reference for the ID of a threadless steerer: not sure that there is a standard.
Threaded steerers are almost all 22.2mm...
b) ... except French standard which are 22mm.
Either way you need to get your Verniers out.
http://sheldonbrown.com/cribsheet-headsets.html