The Radiomir Regatta 1/8^th Second Titanio – 47 mm is a new special edition split-second foudroyante chronograph designed by Officine Panerai for the Panerai Classic Yachts Challenge 2010, that combines various functions characteristic of top-end mechanical watch-making, including a scale for calculating boat speed in knots.

The split-second or rattrapante function allows two simultaneous events to be clocked, thanks to two overlapping, partially independent hands. The foudroyante function activates a small hand that rotates in the dial at nine o’clock, making one rotation every second. When the chronograph stops, the hand comes to a halt on the relative fraction of a second. With the new Radiomir model, this is precise to one eighth of a second.

The Radiomir Regatta 1/8^th Second Titanio – 47 mm watch has a power reserve of 42 hours, an automatic OP XXI calibre, with a diameter of 13 ¼ lignes and 40 jewels, double column wheel, anti-shock device and finely decorated bridges with a perlage and Côtes de Genève pattern. The balance ticks 28,800 times an hour at a frequency of 4 Hz, permitting one eighth of a second precision.

Finished in brushed titanium with a fine polished bezel, the 47 mm case is watertight to 10 bars (approximately 100 metres), unusual for a chronograph with these characteristics but typical of Panerai tradition. The back plate has a large sapphire crystal window showing the complex movement, while the cut-off cone-shaped winding crown houses the control button for the split-second chronograph hand.

A 1.9 mm thick anti-reflective sapphire crystal protects the classic-layout Panerai dial, with two large luminescent Arabic numerals and hour markers. On the left, is the small dial indicating fractions of seconds, and on the right, there is the minute counter with the scale in knots, in other words nautical miles (1,852 metres) per hour.

With reference PAM00343, the Radiomir Regatta 1/8^th Second Titanio – 47 mm is limited to only 500 units and comes complete with a leather strap fastened by a brushed titanium buckle.