I'd agree with cherrybomb... That down tube looks too fat. It has all the other ingredients of an Aluminium "O" though. Has it got any frame numbers on it at all?..... I can check against my ones if you want.
The one in Dave_H's post is a '92 as it has top routed cable mounts and a replaceable mech hanger. It's currently stripped of paint and waiting for an orange/ white fade repaint and a tasty set of RC35's.
I've got spare early vinyl cut graphics in orange if you need some.
I waited for and had one of the first Alu O produced when new, and it was canti. U brake phase had gone by this time also - couple of years too late.
Does look very similar though. It was my first thought until I read U brake :?
In keeping with the thread.... here's another Pic of my Ali "O". To satisfy those interested in the room decor... here's the other side of the room!!! ....piece together all of my posts and you might get the whole room!!
The one in Dave_H's post is a '92 as it has top routed cable mounts and a replaceable mech hanger. It's currently stripped of paint and waiting for an orange/ white fade repaint and a tasty set of RC35's.