BUY 1 (#12) was a famous 50s racing grey Mk1 3.4, still around today for retro events. I don't pay much attention to baby Hot Wheels, but occasionally notice they do very specific old racers with very accurate liveries which they don't fully identify - there's a trio of delightful Mercedes 300SEL 6.8 AMG racers (red, yellow and silver test livery) which are well worth finding.