Rolex Caliber 3187 Complete Guide

Very generally speaking, Rolex tends to use the same movement for a number of watches. For example, the 3135 Caliber can be found in the Datejust, Submariner, Yacht-Master, and Deepsea Sea-Dweller. The Caliber 3187 is a bit different, however. And we’ll go into why. Let’s look at the caliber 3187 in detail.

Rolex Caliber 3187

What is interesting about the Rolex caliber 3187 is the fact that it is only used for one watch – the Explorer II 216570.

This movement was introduced in 2011, which is the year that the Explorer II reference 216570 was released. This movement replaced the previous Explorer II caliber 3186, which was used in the Explorer II 16570. The Caliber 3186 was replaced by the 3187 for one primary reason – size. Unlike the previous Explorer II which is 40mm, the Explorer II 216570 has a diameter of 42mm, which means a need for a larger movement. This means that, at its core, the caliber 3187 is a caliber 3186, only enlarged to fit the new Explorer II. Most parts are interchangeable, but the latter has a larger baseplate and some parts have been reworked to make the larger movement possible.

The movement incorporates the same technology as its predecessor, which means Parachrom hairspring and shock absorbers. However, the caliber 3187 uses Rolex’s own Paraflex shock absorbers for improved resistance to shocks and extreme temperatures. After all, it is an Explorer movement.

The movement displays hours, minutes, and seconds, as well as an additional 24-hour hand to display a second time zone.

The Caliber 3187 is a certified chronometer that has passed the stringent test of the Swiss Official Chronometer Testing Institute (COSC).

Rolex Caliber 3187 specifications

Accuracy: -2/+2 Seconds per day (COSC certified)
Perpetual rotor. Bi-directional.
Technology: Paramagnetic blue Parachrom hairspring, Paraflex shock absorbers
Functions: Hours, minutes, seconds, date, 24-hour GMT hand. Second-time zone with independent rapid-setting of the hour hand. Instantaneous date.
Diameter: 30.97mm
Height: 6.47mm
Power reserve: 48-50 hours
Jewels: 31
Frequency: 28800 BPH

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