A captivating 42 mm Chronomaster Open in brushed and polished stainless steel, featuring a blue sunburst open-heart dial with a cut-out between 8 and 11 o’clock that unveils the beating El Primero 4061 movement, elegantly bridging design and horological tradition. Reference: 03.20416.4061/51.M2040 Movement (Calibre): Zenith El Primero 4061 automatic chronograph; high-frequency, column-wheel chronograph with 12-hour capability, small seconds, and central chronograph functions; approx. 50-hour power reserve Case: 42 mm stainless steel (brushed and polished); round, with fixed polished bezel; sapphire crystal front and exhibition back; water-resistant to 100 m (10 ATM); case thickness approx. 14.05 mm Dial: Blue sunburst-finish dial with open-heart aperture showcasing the high-beat chronograph escapement; applied baton hour markers and faceted hands; chronograph registers (12-h, 30-m, small seconds); tachymeter scale on outer flange Clasp/Buckle: Stainless steel folding (deployant) clasp on bracelet Strap: Integrated stainless steel bracelet