Not trying to insult or be rude. The chainstay yoke appears to be the machined style, not forged. The Factory version is made of 7000 series aluminum, and not 6061. The Factory seat-stays are radically tapered down to a small diameter at drop-outs. Not certain of this, but none of my Factory frames have re-inforcement at headtube/downtube jucntion. Not sure of this either, but I have not seen a Factory version hardtail of that generation with disc mounts. Maybe the original owner was mistaken in his description to you? Anyone else please comment. I am not the expert.