Serotta Davis Phinney, 1992 Serotta T Max,1984 Specialized Allez, Olmo, 1974 Strawberry,Redline bmx, ect.,
Looks like a scratch to me. To see if it is structural take your thumbs next to the crack and see if you can flex the crack of the carbon or get the crack to move, if notthe frame is fine. If it does flex then there is probably a crack and you can get that fixed through Calfee Design, And I have seen there work and it is excellent. Good luck
It's not a crack, which is evident in the picture 531phile posted. Cracks have chipped clearcoat (top layer of resin) and frayed edges with fibres poking everywhere.
What you see in your photos is an artifact of production methods. The real structural part of the frame is not visible and is composed of multiple layers of unidirectional carbon-fibre. The final layer on top is mainly a cosmetic weave for the carbon-fibre "look". This weave comes in flat sheets like fabric. It's cut to a particular pattern (like a dress) that fits around the frame evenly. To fit flat sheets around round and curved parts requires elaborate cutting to make all the pieces fit with uniform coverage. Even then, there are still edges and overlaps. What you see there is a seam where two edges meet. If you feel it, it should be perfectly smooth due to the frame being compressed into a mould.