Maybe it is not iconic as some of the others or as technologically ground breaking, but for me it has to be the 1977 Lotus John Player Special driven by Mario Andretti.
I had turned 16 that summer and my friends and I were car crazy. We made our annual pilgrimage to camp at Mosport for the weekend of the Canadian Grand Prix. Back in those days the cars and drivers where not locked behind barriers and chain link fence. You could actually walk the pits and get close to the drivers and mechanics. I had an opportunity to actually speak with Mario early in the weekend and was awe struck. I think wandering those pits helped cement my life long love affair with just about all things motorsports.
I didn't realize until I was much older what my friends and I actually got to see. The introduction of Gilles Villeneuve driving for Ferrari, the three wheel Tyrrel, James Hunt, Ronnie Peterson, Alan Jones,Riccardo Patrese and Jody Scheckter.
We where just enjoying a fall weekend, drinking beer, chasing girls and watching cars.