The torch.

   Its design recaptures the "Mexico 68" logo, featured on the emblem as well as on the posters. It is cone-shaped, grooved and carved, and bears the inscription "MEXICO 68" on the top at the side where the flame comes out.

Credit : IOC

For further info., please visit http://www.olympic.org/uk/games/past/index_uk.asp?OLGT=1&OLGY=1968.