I had a sigma sport frame just like yours carbon rear stays alloy frame .sold it to a mate who built it up with 105 groupset and some 30mm carbon rims.
Yep, I think that’s the same one - I reckon a few shops had the same one but branded as their own - Dedaccai certainly do that - I reckon I’ve seen Dolan, Condor, Hinde (and now Sigma!) that are all essentially the same - I guess this one never got round to having anyones stickers on it!
Now down to £295 -