During the drivers’ parade that preceded the Japanese Grand Prix on October 4, Williams’s Kazuki Nakajima rode in this vintage Japanese roadster. Can you help us figure out what it is?

After a two year detour to Fuji Speedway, the Japanese Grand Prix returns this Sunday to Suzuka Circuit, Honda’s scintillating test track where Ayrton Senna ran a pulverizing qualifier to take pole position twenty years ago.