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That looks like a internal (IS) headset to me, have a look at http://www.parktool.com/blog/repair-help/headset-standards#article-section-5
That has all the info on every headset standard
HelicopterHelicopter
Been advised to post in here.
I don't know where to buy a headset that fits, I'm pretty sure I can find bearings but I need the full headset with all races etc.
The OD of the headtube is 42mm and the ID is 38. I don't have calipers but the 1.1/8" Orbit FSA doesn't fit and I have measured it another way. There's no taper.
Sorry if this question is a bit benign and the pics don't help.
Cheers.