Looks like one of those you got from the dealership when you bought a new car. They usually had a much glossier finish than a standard injection-molded kit; I used to have a '78 Elco in black, and it was 100 times better-looking than any kit I could buy.
This is incredibly done, I'd swear that this was an actual full size car if the fence in the background didn't give it away.
It's probably a resin kit, not a promo. With resin kits, a model maker casts the kit, then copies are done in resin plastic (not the usual 'kit plastic'). You may have to buy a 'regular' kit of say a similar coupe model to get all the necessary parts to complete the kit.
