22: 1939 Lagonda V12
Jay Leno has many unique roadsters in his collection, from the Bentley models to this particular 1939 Lagonda V12. Even to this day, the V12 engine is one of the most awe-inspiring ways to drive around. Multiple sports car companies incorporate a V12 engine into their design (via Top Speed).

Leno has managed to keep his 1939 Lagonda V12 in great condition. Everything from the paint job to the top is in great condition. As with most of his car collection, the 1939 Lagonda V12 is a rarity that the average car enthusiast would never see. Leno has been known to bring this out on the show circuit now and then.