I concur, this is not consistent with a Montello, even the European versions with external, rear brake cable routing. The European versions I've seen have used the bridgeless bottom bracket shell and this appears to have a traditional bridge. It also doesn't have a front derailleur hanger, typical of all Montello that I've seen, regardless of the market. My leading candidate would also be a mid-1980s Treviso.

I also think this is repaint. Besides the non-flaking logo decals,which are rare on a Pinarello, it's missing the palmares decal, which is the one decal that is usually intact on a PInarello. Finally, it's missing the pinstriping at the borders between the chrome and painted areas.