Rolex 3156

	Brand:	Rolex
	Family:	Rolex Parachrom Family
	Height:
	Jewels:	31
	Reserve:	48 hours
	Frequency:	28,800 A/h
	Winding:	Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding
	Diameter:	30.97 mm
Rolex Cal. 3156 © Rolex	Complications:	Date, Day, Hacking Seconds, Hand Winding, Outer Day Wheel, Quick Date Correction, Quick Day Correction
	Hands:	Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day Window at 12:00

Distinguishing Technical Characteristics
Central-Rotor Automatic Balance Bridge Microstella Balance Balance Balance at 6:00 Central Rotor
Production: 2008 – 2015
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Cal. 3156 is an automatic movement with day and date wheels produced by Rolex since 2008. It was used in the oversized Rolex “President” Day-Date II watch, Ref. 218000, from 2008 through 2015. This movement was part of the Parachrom family and featured the Parachrom hairspring and Paraflex anti-shock device. When Rolex updated the Day-Date, becoming the Day-Date 40 in 2015, it received the new Chronergy family Cal. 3255.

• 2008-2019 Rolex Day-Date II, Ref. 218000

As oversized watches became popular in the 2010s, Rolex created a group of special oversized movements. Cal. 3132, 3136, 3156, and 3187 all have a 2.5 mm wider main plate, bringing the movement dimension to 30.97 mm. This is not well-documented, and many sources list these movements at the Rolex standard diameter of 28.50 mm. The difference is obvious at a glance, however, with the wider flange visible in Rolex promotional shots and in the watches themselves. This larger size allowed the date wheel to be enlarged, moving the date display 1 mm further from the center on the large Datejust II and similar models.