CALIBRE 3187

Introduction and Launch: The Rolex calibre 3187, introduced in 2011, is a self-winding mechanical movement designed and manufactured entirely in-house by Rolex. It powers the Explorer II Ref. 216570, replacing the previous calibre 3186. Built for durability, the 3187 features a Parachrom hairspring and Paraflex shock absorbers, enhancing its resistance to shocks and magnetic fields. It also includes a date function and an independently adjustable GMT hand, allowing the wearer to track a second time zone. With its precision and reliability, the calibre 3187 perfectly complements the rugged nature of the 42 mm Explorer II.

Technical Specifications

Jewels:
31 Jewels
Power Reserve:
Power reserve of approx 50 hours
Beat Rate:
Operating at 28,800 vibrations per hour (4Hz)
Movement:
Self-Winding mechanical movement
Escapement:
Calibre 3187 features a traditional Swiss lever escapement. It consists of a balance wheel, hairspring, pallet fork, and escape wheel. This mechanism not only regulates the energy release from the mainspring but also maintains the balance assembly at a consistent and precise rate
Anti-Shock:
Paraflex Anti-Shock System
Hairspring:
Parachrom Blue Hairspring
Certification:
Calibre 3187 is certified by the Official Swiss Chronometer Testing Institute (COSC) for precision and accuracy, as well as Superlative Rolex certification

Design and Features

Hands Configuration:
Hours, minutes, seconds and a date window at 3 o'clock

Watches with this Calibre

Rolex Explorer II:
216570
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