OP,
It looks like my GIOS SR, if it was repainted that could explain the "upgrades" of the decals etc.
is the seat post campy, what does the seat tube look like?I would not be overly concerned about the lack of the"hole" for the Portacatena, it might be filled or left not being drilled.
White was a later color combo.....only downside is the repaint....on the other hand that means you can ride and enjoy it without being overly compulsive about "condition, my Gios is still my favorite go to.
Best, Ben