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Manual Zenith Defy El Primero 21 18.9000.9004/71.R585 Watch

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Manual

5 <

ENRUJPDEESIT FR ZTZHAR

In front of you is the El Primero 21 movement. It is the only

mechanical 1/100th of a second chronograph movement.

The El Primero 21 movement is a masterpiece of modern

engineering. Constructed using state-of-the-art methods and

ﬁnished using the newest technologies and materials, this

movement fulﬁls two objectives: a ﬁnish of the highest possible

quality, and optimum performance and accuracy on the wrist.

First released in 1969, the world’s most accurate series-made

chronograph entered a new era of mechanical timekeeping with

the El Primero 21 movement.

An impressive frequency of 360,000 vibrations per hour is

testament to the groundbreaking ingenuity of Zenith, and enables

precise measurement of time periods to a hundredth of a second.

The jump from tenths to hundredths of a second is a quantum leap

in terms of watchmaking performance and engineering.

For Zenith, accuracy is the absolute priority. To avoid any risk

of the chronograph affecting the accuracy of the time display,

the El Primero 21 movement is equipped with a “double-chain

structure”.

1 > EL PRIMERO 21 MOVEMENT

This means that the time display and chronograph each have

their own completely independent mechanism with its own

barrel and high frequency escapement.

For the chronograph, this oscillates at a breathtaking 50 Hz

(360,000 VpH). As standard for the El Primero, the time display

calibre oscillates at 5 Hz (36,000 VpH).

Key features

El Primero 21 (Calibre 9004)

Diameter: 32.80 mm (14 ¼)

Thickness: 7.90 mm

Number of components: 293

Number of jewels: 53

2 barrels:

> Watch power reserve: 50 hours

Frequency: 36,000 VpH (5 Hz)

> Chronograph power reserve: 50 minutes

Frequency: 360,000 VpH (50 Hz)

Unidirectional automatic winding for the watch and manual winding for

the chronograph.

Functions:

> Hours, minutes and seconds

> 1/100th of a second central chronograph

30-minute counter at 3 o'clock

60-second counter at 6 o'clock

Chronograph power reserve at 12 o'clock

Download manual in English (PDF, 6.93 MB)

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Specifications

Brand	Zenith
Model	Defy El Primero 21 18.9000.9004/71.R585
Category	Watches
File type	PDF
File size	6.93 MB

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Frequently Asked Questions about Zenith Defy El Primero 21 18.9000.9004/71.R585 Watch

Our support team searches for useful product information and answers to frequently asked questions. If you find an inaccuracy in our frequently asked questions, please let us know by using our contact form.

A battery in my device is oxidized, can I still safely use it? Verified

Ja, the device can still be safely used. Firstly, remove the oxidizd battery. Never use bare hands to do this. Then clean the battery compartment with a cotton swab dipped in vinegar or lemon juice. Let it dry and insert new batteries.

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My mechanical watch runs fast, what can I do? Verified

This might be caused by exposure to a magnetic field. It can be solved by a demagnetisation process performed by a professional watchmaker.

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What do AM and PM stand for? Verified

AM stands for Ante Meridiem and indicates that the time is before midday. PM stands for Post Meridiem and indicates that the time is past midday.

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What is a 'Chronograph'? Verified

A 'Chronograph' is literally a 'writer of time'. The term is used to describe clocks and watches that tell the time of day as well as measure a certain period of time, like a stopwatch.

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What is GMT? Verified

GMT stands for Greenwich Mean Time (sometimes called UTC, standing for Coordinated Universal Time). It is the time for the longitude 0, that passes through Greenwich near London.

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What is a quartz movement? Verified

Watches and clocks with a quartz movement are driven by a battery. This sends an electric current through quartz crystals that will vibrate. These vibrations are passed on to the movement. Because the vibrations have a fixed frequency, watches and clocks with a quartz movement are extremely precise.

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