The front mech is definitely Centaur. As you mentioned, the brake levers aren’t really visible but they look a bit shiney and maybe too wide for Olympus so I suspect they’re Centaur. We would have to see a better photo to confirm.Hello
I think it's almost all Campagnolo Olympus, the crank set has a black cap, the rear derailleur is silver and black.
quick releases are olympus, not sure about hubs, could be centaur
The brake levers are not visible.
Brake are centaur or olympus
In those years they always mixed a bit of everything
I think the crank might be better finished than silver version of Olympus