This is a special edition Monaco made for the ACM—the Automobile Club de Monaco. The ACM was founded in the 19th century as a cycling club, changing its focus to car racing in the 1920s. Monaco's premier automobile club, it rose to international prominence in the 1950s when it founded the Grand Prix de Monaco, which remains one of the world's most important motor sports events. Though there have been many watches made in its honour, none are quite as fitting as the legendary Heuer Monaco, for obvious reasons. The square-cased beauty is one of the brand's most iconic and popular collections, and this special edition features the ACM's crest prominently on the caseback.