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The CHRONOMASTER Open offers a view of the beating heart of the El Primero movement from the dial. Crafted in a sleek 39.5mm steel case, this version features a matte silver dial with tricolour counters and a transparent counter for the running seconds, paired with an integrated steel bracelet. Powered by the El Primero 3604 1/10th of a second automatic chronograph movement.
| SPECIFICATIONS | |
| Key Points | Automatic El Primero column-wheel chronograph able to measure and display 1/10th of a second Opening revealing the legendary beating heart of the El Primero movement Silicon escape-wheel and lever Increased power reserve of 60 hours Stop-second mechanism |
| Movement | |
| Name | El Primero 3604 |
| Auto/manual | Automatic |
| Components | 269 |
| Jewels | 35 |
| Frequency | 36,000 VpH (5 Hz) |
| Power-reserve | approx. 60 hours |
| Functions | Hours and minutes in the centre Small seconds at 9 o'clock 1/10th of a second Chronograph: - Central chronograph hand that makes one turn in 10 seconds - 60-minute counter at 6 o'clock - 60-second counter at 3 o'clock |
| Case, Dial & Hands | |
| Thickness | 13.60 mm |
| Water-resistance | 10 ATM |
| Case-back | Transparent sapphire crystal |
| Crystal | Domed sapphire crystal with anti-reflective treatment on both sides |
| Hour-markers | Rhodium-plated, faceted and coated with SuperLuminova SLN C1 [Hour markers] |
| Diamonds | No |
| Straps & Buckles | |
| Interhorn (case) | 20 |
| Interhorn (buckle) | 16 |
| Interchangable Strap System | No |
298 OAKBROOK CENTER
OAK BROOK, IL 60523
Monday-Saturday: 11am-7pm
Sunday: 12pm-5pm
Memorial Day: 11am-5pm
E-140 Woodfield Mall
Schaumburg, IL 60173
Monday-Saturday: 11am-6pm
Sunday: 12pm-6pm
Memorial Day: 11am-5pm
