Navigraf Heritage - Wristwatch YEMA - Free user manual and instructions

Product Type	Mechanical Watch
Brand	YEMA
Model	Navigraf Heritage
Movement Type	Automatic (self-winding)
Case Material	Stainless Steel
Case Diameter	39 mm
Case Thickness	12 mm
Lug Width	20 mm
Strap Material	Leather
Crystal	Domed Sapphire with AR coating
Water Resistance	50 meters (5 ATM)
Functions	Hours, Minutes, Seconds, Date
Power Reserve	Approximately 42 hours
Caliber	YEMA2000 (based on Sellita SW200)
Frequency	28,800 bph (4 Hz)
Warranty	2 years
Care Instructions	Clean with soft cloth; avoid chemicals; service every 3-5 years
Safety	Keep away from strong magnetic fields; avoid extreme shocks
Spare Parts Availability	Through authorized service centers
Repairability	Serviceable by YEMA or qualified watchmaker

Frequently Asked Questions - Navigraf Heritage YEMA

How do I wind the watch manually?

Turn the crown clockwise in position 0 (pushed in). About 30-40 turns are needed for a full wind. The watch also winds automatically with wrist movement.

How do I set the time and date?

Pull the crown to position 2 (quick-set date). Turn clockwise to set date. Then pull to position 3 to set time. Push crown back after setting.

What is the water resistance of the Navigraf Heritage?

It is water resistant to 50 meters (5 ATM). Suitable for swimming but not diving. Ensure crown is screwed down.

How often should I service the watch?

YEMA recommends service every 3-5 years by an authorized watchmaker to maintain accuracy and longevity.

Can I replace the strap myself?

Yes, the lug width is 20 mm. You can change the strap using a spring bar tool. Ensure the spring bars are properly secured.

What type of movement does this watch use?

It uses the YEMA2000 automatic movement, based on the reliable Sellita SW200. It has 26 jewels and a power reserve of ~42 hours.

Why is my watch running fast or slow?

Mechanical watches can vary due to magnetism, temperature, or low power. If consistently off, have it regulated by a watchmaker.

Is the crystal scratch resistant?

Yes, it features a domed sapphire crystal with anti-reflective coating, which is highly scratch resistant.

How do I adjust the leather strap length?

The strap may be pre-sized. For adjustment, visit a jeweler or use the buckle holes. The strap can also be replaced with a different size.

What should I avoid with my mechanical watch?

Avoid strong magnetic fields (speakers), extreme shocks, and exposure to chemicals. Always store in a dry place.

USER MANUAL Navigraf Heritage YEMA

Your YEMA watch is equipped with a screw-down crown. A screw-down crown ensures waterproofness by sealing the crown to the case of the watch.

POSITION B MANUAL WINDING

Your YEMA watch is equipped with a self-winding mechanical movement, this means is wound automatically by wrist movements alone. To ensure optimum winding, wear your watch daily.

Before you first use the watch or if unworned for a long period of time, you will need to wind it manually by unscrewing the crown and then turning it clockwise.

POSITION C RAPID DATE-SETTING

If your YEMA watch is equipped with a date, to adjust the date, unscrew the crown and pull it out to the second notch. Then simply turn it clockwise until the desired date appears in the window. During this operation, your watch will keep running.

IMPORTANT: Do not make date adjustments when the time on the watch reads between the hours of 9:00pm and 3:00am. The reason is that although a date makes its changeover close to midnight, the gears that make that change happen to engage quite a bit earlier. It takes extra time to disengage completely in the aftermath.

TIME SETTING POSITION D

In order to adjust the time, unscrew the crown and pull it out to the last notch. Then turn it in either direction until the hands indicate the correct time. The small seconds hand is stopped during this operation, allowing the time to be set accurately.

BEZEL-LOCK MECHANISM

As an extra safety measure, YEMA developed a proprietary bezel-lock mechanism in the 1960s, which is still used nowadays and brings a unique look to the Superman Collection.

Top-down view of a wristwatch with analog clock face and wrist strap (no text or symbols visible)

BEZEL FUNCTIONS

Top-down view of a wristwatch with yellow dials and a white analog clock face showing 20, 30, 40, and 50 degrees (no text or symbols beyond clock markings)

The unidirectional rotatable bezel allows precise measurement of dive times. For safety, the bezel rotates counter-clockwise only.

Before beginning your descent, unscrew the crown to POSITION B to unlock the bezel, then turn the bezel until the 12 o'clock triangle marker is opposite to the minute hand. To finish, screw-down the crown to POSITION A.

This indicates the beginning of the dive. The duration of the dive is indicated on the graduation on the bezel by the minute hand.

MAINTENANCE

OF YOUR YEMA WATCH

A YEMA watch requires little maintenance. However, some precautions must be taken to ensure the durability of your YEMA:

• Ensure that the crown is perfectly screwed down after winding up the movement and/or setting the time and the date. Once the crown is fully screwed down against the case, your YEMA watch is guaranteed waterproof.
• Avoid activities that may expose your watch movement to shocks.
• Never use chemicals to clean your YEMA watch. Use a microfibre cloth and wash the metal, rubber, fabric bracelets and waterproof cases from time to time with a soft brush and soapy water. We recommend that you do not use abrasive or corrosive products (solvents, detergents, perfume, etc.).
  · Always rinse your watch with fresh water after it's been exposed to salt water.

BRONZE WATCH MAINTENANCE

YEMA bronze watches develop a darker appearance due to the natural process of patina, they can create a build up of dark and/or greenish coating in areas of the watch depending to the degree of exposure to atmospheric conditions (heat, humidity, pollution) and when used during aquatic activities on the seaside (salty water) and swimming pools (chemicals). Most customers love this, as it adds character to the watch that becomes unique to each wearer.

However, one can easily reverse reverse the patina and bring your bronze watch back to a healthy shine in just a few minutes. To do so, create a paste out of baking soda and lemon juice, apply an even coat of the paste to the bronze watch, then rub it away with a soft toothbrush or cloth after and allow it to sit for 20-30 minutes with the paste still on it. Remove the paste and rinse the watch under warm water. Dry and polish with a cotton cloth ensuring that all of the paste has been removed. If any patina still remains then repeat the process. Your bronze watch will now be cleaned and should look almost as good as new.

CALIBER: MBP1000 POWER RESERVE: 45H

MODELS:

SUPERMAN HERITAGE BRONZE | YSUPZ2019

SUPERMAN BRONZE BORDEAUX | YSUPZ2019D

SUPERMAN BRONZE BLACK | YSUPZ2019C

NAVYGRAF HERITAGE | YNAV2019

SUPERMAN II MAXI DIAL | YSUPII2019-AMS

YEMA WATCHES reserves the right to modify the models illustrated in this publication at any time.