I believe that's the Gray Avanti that sold recently on BAT. It was a beautiful car, but from the pictures, I didn't think that gray was a very good match to Avanti Gray. I have an identical car which I'm restoring. Mine was originally Avanti Gray and it had areas of factory paint that were in good condition for matching. The original Gray was more of a blue-gray as opposed to this color, which is warmer. The pictures of the BAT Avanti confirm the difference. Compared to the exterior shots, the original paint on the underside of the trunk lid appears bluish-gray. It's evident again, when comparing the original underhood finish to the fender top.
I make the point not to knock the BAT Avanti, but to help someone trying to pick an original color for their car. IMO, the BAT car's current color looks better than the original Avanti Gray, which I'm not a fan of. I struggled with changing the color on mine, knowing that a Gray exterior/Red interior was a fairly rare combination. Ultimately though, I chose to use Avanti Red because I really didn't care for the original Gray but wanted to stick with an Avanti color option. To assuage my guilt, before painting the car, I made an aluminum plate which I attached to the firewall, covering a well-preserved portion of the original Gray color. Should a future owner wish to return the car to original color, they'll have a sample.
Matching colors in modern paint systems is difficult. I was a product designer (now retired) who did it a lot and I still spend an inordinate amount of time getting it right. My brother is in the automotive paint business (represents Axalta--formerly DuPont) and he's a great resource. We have a copy of the DuPont Spectramaster chip book, which has thousands of color chips. Even with this excellent reference, it's usually not possible to nail a match without additional tinting. Depending on the project, we sometimes find it easier to just go with the closest "stock" color in the Spectramaster range, rather than custom-tinting and worrying about having to match it again in the future. After a lot of sampling, I think we landed on a good match for both Avanti Red and Avanti Gray, in the Chromapremier line. Bad news is Axalta is phasing out Chromapremier, so the formulas will change again soon. I'm happy to provide formulas for what I matched in Chromapremier, if that would be helpful.