Originally Posted by
mechBgon
That's what I thought, too, Stumpjumper M2 or S-Works M2. They were particularly tough to gouge, being metal matrix composite, so look at the area where you'd expect to see chainsuck gouges, and see if it's merely got surface scratching.
The dropouts don't have threaded holes either, which the A1 frames from that year did IIRC. Must be an M2.