Unknown 753 SBDU?

tractordrafter

Old School Hero
Hello all,

I have a potentially special frame that I've not been able to correctly identify. It appears for all the world like an sbdu.

I've done a lot of research with regard to the lugs, dropouts and tubing etc but still no definitive answer.

So far I have deduced these facts..

753 metric
Campagnolo dropouts
Prugnat super professional lugs with 5mm circular cutouts
Oversized seat stay caps (as per Raleigh 753)
Capella brake 'lugs' on a tapered tubes with a gipiemme boss
Under BB cable guides

The question is, it has no serial numbering, or any I can find as yet

It is extremely light weight.

I will upload some pics but any help would be appreciated. It rides very well, as to be expected but I'd love to know its history.

Part of me wants to think it's a prototype SBDU
 
It would be good to see some images of the frame and fork and some details of all the little stuff ... fork ends, fork crown, BB, brake and chainstay bridge... do you know seat pin size? Have you looked on the fork column for a serial number?
 
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