ERTL has long been a big name in the diecast business, and one with a reputation for marketing the same few castings with infinite variations of colors and wheels. Virtually their entire business was based on their American Muscle line, endlessly releasing the same Camaros, Chevelles, Mustangs and what-have-you in different colors. This one is a 1973 Pontiac Firebird Trans Am from their 10 Fastest Muscle Cars series.
It's really kind of a shame, since older ERTL models have a strong following and command high prices on the secondhand market. RC2 now owns all the ERTL castings and their new releases frequently sell for $50-60. The 1973 Trans Am is a handsome car sold short by a half-baked casting and iffy quality control that almost reduces it to a mere toy. I don't understand why ERTL chose the '73 as the #6 "fastest muscle car", either, since the '73 was choked by emissions control equipment. The 1970-72 looked just like it and didn't have that problem. Oh well.
As said previously, this model looks great on a shelf. Leave it there.