eBay and Craigslist finds

It's a very good fake it is as it has all the pantographed features of a Pinarello I owned that was a similar vintage, i.e. the GP (for Giovanni Pinarello) on the tops of the seat stays and BB shell.

I'm pretty damned sure that isn't a fake...the pantograghing is correct as is the shape of the plinth on the bottom bracket, it all seems fine...down to the seat pin bolt...
Why on earth would you think its a fake?