This is a stainless steel Glashutte Sport Evolution Chronograph, reference 39-31-44-04-03. It has a black textile highly durable Kevlar sports strap with a rubber core, a tri-fold deployant buckle, and a scratch resistant anti-reflective coated sapphire crystal. There is an exhibition screw down sapphire display case back secured with 5 screws, a screw-down winding crown with a crown protector, and rectangular chronograph pushbuttons. The 42mm diameter solid three-body case, downturned lugs, a rounded aluminum bezel with a black engraved Tachymeter to 300 UPH, are polished/brushed. The dial is silver with two tiers; it has silver SuperLuminova baton hands with red tips, a center chronograph sweep hand with a red tip, applied faceted square hour index markers, and an outer black minute/one-fifth second track with red Arabic numerals every five minutes. There is a subsidiary 30-minute dial at 9 o'clock, a small constant seconds register is at 3 o'clock, and a 6-hour chronograph sub dial at 6 o'clock. It's water resistant to 100m/330 feet, it has a 40-hour power reserve at full wind, and the 14.15mm case, dial, and movement are all signed. This Glashutte Original Sport Evolution Chronograph, reference 39-31-44-04-03, has a mechanical automatic self-winding Glashutte Original 39-31 movement. It's rhodium plated and finely finished with striped/ribbed "cotes-de-Geneve" texture, some hand engraved designs, and beveled component edges. It's constructed with 51 jewels, a shock absorber mechanism, and a straight-line lever escapement. It has a self-compensating flat balance spring, a swan-neck regulator, a hacking seconds mechanism for precision time setting, and a rotor with 21 K gold segment. The mechanism oscillates at a frequency of 28,800 vph (4 Hz).