Browsing Hilary Stone's site, I saw this Simoncini
"SIMONCINI AERO ROAD FRAME
Seat Tube (ctc): 59cm (23.5in)
Top Tube (ctc): 58cm (23in)
Rear dropout width: 126mm
Wheel size: 700C/sprints with brake drop of 45mm
Seatpost size: 26.8mm
Frame tubing: Oria ML25
This Italian built Simoncini aero road frame is built from Oria ML25 tubing which has been reshaped into aero profiles on the seat and down tubes. I think it dates from the later 1980s. The paint is generally very good with just a few small areas that could do with being touched up. £145"
The only differences with mine, that I can see, are that it takes a 26.8mm seatpost (mine is 27.2mm) and it has lugged forks. It's even the same size!
Does anyone know if Simoncini were in the habit of building frames for others?
If nothing else it, and the blurb for the Jan Janssen listed below it, confirms that during the late Eighties/early Nineties, reshaping tubes into an aero profile wasn't so uncommon.
I'm tempted to buy it, just to be able to compare the two...