Gear ratios from Niki Lauda's 1984 German Grand Prix McLaren MP4-2 TAG Turbo, two steel gear cogs, 9.5 and 7cm. diameter, with a 10 by 14cm., 4 by 6in

Gear ratios from Niki Lauda's 1984 German Grand Prix McLaren MP4-2 TAG Turbo, two steel gear cogs, 9.5 and 7cm. diameter, with a 10 by 14cm., 4 by 6in. wooden base bearing a brass plaque inscribed MARLBORO McLAREN MP4 GEAR RATIOS, NIKI LAUDA 2ND, 1984 GERMAN GRAND PRIX, sold with a McLaren International COA (4). Niki Lauda finished second behind team-mate Alain Prost in this race, as he would in Holland and then Portugal where he became F1 World Champion for the third time, beating Prost by merely half a point.