To mark its 150th anniversary, TAG Heuer will re-issue the Silverstone Chronograph in February 2010 as a limited edition piece. Originally introduced in 1974, the Silverstone is instantly recognizable by its cushion cut-shaped case. Named for the famous racing circuit in England, the Silverstone followed the Monaco, incorporating TAG’s patented technical breakthroughs that made waterproof square and barrel-shaped cases possible. For the Silverstone, TAG Heuer’s design team softened the Monaco’s angles. Both the original Monaco and Silverstone housed the Chronomatic Caliber 11, the first self-winding automatic chronograph with micro-rotor. Before the Caliber 11, chronographs were hand-wound and watchmakers placed the crown at 3 o’clock for easy access . Caliber 11 freed TAG Heuer’s designers from this constraint, and Jack Heuer decided to place the crown of the Monaco and Silverstone at 9 o’clock. The reborn Silverstone is powered by an updated version of the Caliber 11 with Dubois-Depraz module. focnj.com Available with a rich blue or brown dial on a matching, perforated alligator strap, the Silverstone is available in a limited worldwide quantity of 1,500 pieces per color. It will retail for about $6,500.