Sorry, didn’t have a chance to get back to the computer.
I’ve been googling dyna techs and can’t see any that look completely right. The routing of the cables along the top of the top tube seems different to the dyna techs which seem to have cables more to the side of the tube.
The person I bought it off said it was “a lot” of money at the time, but to a casual cyclist that could mean £500 so I took that with a pinch of salt. It was also described as “custom made” in the ad, but I assume that she just meant it was built up from parts which, judging by the mix of makes, seems right. Bare in mind it was described as an “Oakley frame” due to the sticker on it, so I don’t think too much can be taken from the description.
To answer some other points;
– Don’t take too much from my use of the word “bonded”. My knowledge extends to the fact that the blue bits of the frame stick to a magnet and the silver bits don’t!
– No sign of a badge on the headtube.
– I don’t know how it rides. It was dark when I got home and it is about three sizes too small for me. The gears are out of whack. The fork is less pogo-stick like than I was expecting. The brakes seems sharper than any cantis I can remember trying previously. The tyres seem to have not perished at all. All bearings seem nice and smooth.
Does the chainstay brace behind the BB adjoin nothing the stays or just one?