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@Dammit
The Mrs has an steel Omega frame, fully chromed.
It's got (according to my vernier calipers) a 30.6mm seatpost in it, which goes so far but no further.
It's been cut off very short, I suspect because of this.
The OD of the seat tube is 31.6mm, but it's a mixture of fillet brazed and lugged from what I can see, so the OD gets a lot wider.
I cannot measure what the diameter of the section below the lug is, as my calipers aren't suitable.