Hamilton celebrates the perfection of the circle

Are you familiar with puzzles where, given a geometric drawing, you have to determine how many triangles are contained in the shape? With the "Jazzmaster Performer Auto Chrono 42 mm," you could apply this to a circle. Because this new addition to the Swatch Group brand has quite a few of them.

First, there's the round stainless steel case with a diameter of 42 millimeters. It's made of stainless steel with a black PVD coating and is water-resistant to 10 bar. The back reveals another round feature in the form of a sapphire crystal caseback, revealing the H-31 automatic chronograph movement with a Nivachron balance spring and a 60-hour power reserve.

It provides the precise information on the front of the "Jazzmaster Performer Auto Chrono 42 mm," which incorporates other circular designs into its functionality. From the outside in, it begins with the tachymeter scale on the bezel.

This, in conjunction with the chronograph hand, measures the average speed between two points based on elapsed time. When the chronograph hand is stopped, it displays the average speed on the tachymeter.

This is followed by the easily legible outer ring on the dial for the current time and the exposed date wheel. Finally, at 3, 6, and 9 are the three subdials with a circular brushed finish in blue and silver for the hours, minutes, and running seconds.

The “Jazzmaster Performer Auto Chrono 42 mm” is worn on a black, perforated leather strap with – as you might have guessed – numerous circular indentations.

The RRP is €2,595.