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This has just popped up in my saved searches...
https://www.ebay.co.uk/itm/264328958529?ul_noapp=true
...the listing just screams stolen to me. Especially the inner tubes bit. If you ride a bike like that you'll have some spare tubes knocking around!
The peeling bar tape in pic 4 does it no favours either... Mind you, 105 is the poverty-spec, so perhaps the owner can't afford inner tubes 🙂
It looks fake to me.
Also selling a metal detector and a smashed phone, no PayPal. About as suspect as Brexit party donations.
Can't work out if it's stolen, fake or both. Either way, steer clear.
That saddle is outstanding 🙂

fake, can't find another picture of Dura ace c50 where the c50 is half way round should be closer to the end of dura ace.
Definitely fake. Those wheels look nothing like DA C50s and Pinarello brand their integrated bars Most. Despite supposedly being a recent model it appears to have some old Sora shifters
I'm not very good at my road bike recognition skills, but one way or another there's no way that's a kosher listing.
Could it be a nicked bike that was a mongrel build being used on a turbo trainer - looks like a trainer tyre on the back?