Zenith Chronomaster Open 03.3300.3604/69.M3300

Chronomaster Open (03.3300.3604/69.M3300) The El Primero laid bare: a 39.5mm steel case with Calibre El Primero 3604, a dateless variant with a hesalite window at 9 o'clock revealing the silicon escape wheel and balance beating at 10 beats per second — the most intimate view of the El Primero's mechanical soul available on the wrist.

• Case: 39.5mm | Stainless Steel | 13.10mm thick
• Dial: Silver matte dial, open-heart hesalite window exposing silicon escape wheel and balance at 9 o'clock, tricolour sub-dials in grey and blue, applied luminescent markers
• Movement: Automatic Open-Heart Chronograph, El Primero 3604
• Power Reserve: Approx. 60 hours
• Water Resistance: 100 metres
• Bracelet/Strap: Stainless steel bracelet, double folding clasp