orange specialists!? help

That sounds too big for a steel seat tube. Unlike most steel frames Orange always used to be 26.8 rather than more normal 27.2
 
Yup. later clockworks & P7s are 29.6mm but the website shows 95-97 C16s as 30mm. An odd size I'd agree, but Orange used shims as standard on a lot of frames so that's an option.

I've got a 29.6mm seatpost here you can have for a few bear tokens if you want to try it for size.
 
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