Tag Heuer celebrates the 40th anniversary of its Monaco series this year by paying tribute to the race cars of the 24 Le Mans, which inspired the collection.
New additions include several retreads, including the new concept chronograph.
The star of the series is the Twenty Four Concept Chronograph, which is still in its prototype form. Taking Le Mans race cars as its cue, the prototype features a tubular design and extreme shock-protected components.
A hi-tech design sees an oversized 40.5mm square case - black PVD coated - house a Calibre 36 movement which 'floats' inside and is visible through the dial and the watch back. The movement is suspended in a steel tube - much like the cockpit cage of a race car driver. The centrifugal system shows an innovation of three arrows on an oscillating weight built from industrial-grade tungsten.
A composite filter made from material used in aerospace and motor racing insulates the movement against shock and torque. The calibre beats at 36,000 beats per hour.
The dial has an oversized 24 at the 12 o'clock position, a tribute to the 24 of Le Mans; the blue and orange colours are the same as those that Tag Heuer ambassador Steve McQueen wore in the 1970s film, Le Mans.
The two-part dial has semi sub-counters at 9 o'clock and 3 o'clock, which have 'doubled' hands. The first part of the hand displays zero to 15 minutes when the other part of the same hand passes under the upper dial.