I parted out a very large Guerc (61-62cm?) last year from 1981 with all the panto and super record ti.

The arms have a profile I don't recognize, rounded along their length. The spider also has the cutouts.

I later found an exact proper fork for it, the original owner had replaced the original because of rusting over all of the chrome.

Maybe I should have kept it together, but it was too big for me.

The shift levers had huge cutouts with only a loop of aluminum remaining. I sold those first, one was curved/bent which looked like a purposeful modification.

The paint is like new, but the driveside chainstay chrome is rusty.

I payed 375 plus 45 for the proper sloping fork. The wheels were not original, but Maillard/Araya 700c clinchers instead.
Really kind of a sad fate for the bike, but made better when I located an original fork with long enough steerer.