Omega Chronographs: Instructions/Directions:
Written by Chuck Maddox USA on 29 March 2002,
Last Revised: 29 March 2002, 17:31 GMT
Certain Rights Reserved...
Mark III/Mark IV (Lemania 1342):
Front, Rear
Mark V (Lemania 5100):
Instruction Cover, Features
Composite, Usage, Setting, Notes
Speedmaster 125:
Cover_Text, Operation, Tachymeter
Telemetric, Pulsimetric, Decimal
Feature Discriptions, Usage,
Chronograph, GMT, Bezel

This document has Is basically recycling parts and pieces of other projects that I have been and am currently working on. This compilation is a collection of materials related to the operations of Omega Chronograph Watches. Some of the individual instructions are applicable to other brands of watches... For example watches from other manufacturers which use the Lemania 1342 Base Movement (Heuer, Tissot, Wakmann and also Omega) can use the instructions for the Mark III/Mark IV for example and ignore the elements that do not appear on their particular chronographs (most often the 24-Hour sub-dial). Likewise owners of Lemania 5100 base movement Chronographs (Omega, Heuer/TAG-Heuer, Porsche Design Orfina, Tutima, Sinn, Bell & Ross, Lemania, Tourneau, Revue Thommen, Eberhardt, among many others) can use the instructions for the Speedmaster Mark V, and ignore instructions for any missing features (such as the day indication.

Omega Speedmaster Mark III/Mark IV (Lemania 1342 Base):

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Directions Front:

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Clicking on the picture will open a new window with a 1280 x 800 pixel version of the picture

Directions Back:

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Clicking on the picture will open a new window with a 1280 x 800 pixel version of the picture

Omega Speedmaster Mark V / c.1045s (Lemania 5100 Base):

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Instructions Cover:

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The cover and back panel of original manual for a Mark V c.1045
The cover and back panel of original manual for a Mark V c.1045 (more on this later)... Click on picture to enlarge in a new window...

Description of Features:

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Inside first panel, Click on picture to enlarge in a new window
Inside first panel, Click on picture to enlarge in a new window...

A Composite Annotated Features List:

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A composite graphic, not in the manual, of an annotated diagram of features, created by the author...
A composite graphic, not in the manual, of an annotated diagram of features, created by the author... Click on picture to enlarge in a new window...

How to Use:

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How to use the watch... Click on picture to enlarge in a new window...How to use the watch... Click on picture to enlarge in a new window...

Hot to set the watch:

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How to set the watch... Click on picture to enlarge in a new window...
How to set the watch... Click on picture to enlarge in a new window...

Mark V Instruction Manual Notes:

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This particular instruction manual is an interesting document in and of itself. By it's cover it is clearly intended as an instruction manual for the 1984 production Speedmaster Mark V chronograph, however it's internal photographs are of a ST176.0017 which was produced in 1974~1977 (roughly). Here is the story on this manual as best as I can reconstruct it without being a pest to John Diethelm who heads up Omega's Vintage Information Department... When Omega came out with the Mark V in 1984, they needed an instruction manual for it, but didn't have pictures of the final product yet. So it seems as if they used an ST176.0017 to stand in for the ST376.0806 Mark V... An acceptable solution since operationally the watches are identical. Interestingly enough I have a German Language versions of this same manual, with the same photographs, etc. that I recieved with my Mark V (Henk recieved his with a purchased ST176.0012)... I probably could be persuaded to scan it in if someone were to request it, once I relocated it in the mess that is my work area... Another interesting point about this manual is that there is a rather glaring error in it that is not immediately obvious... In fact I worked on these files several hours before noticing this issue. I'd be real interested to see if anyone can spot it. In fact the first person to spot it will get his or her name included here in this document! (Sorry Henk, since you have had advance access to these it's not really fair to let you compete!)
Thanks again to Heng van de Weg of the Netherlands for his contribution of these scans!

Speedmaster 125 (Lemania 1342 Base):

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Cover Text:

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Omega Speedmaster 125
the automatic chronograph-chronometer
Proud Testimony to 125 years of watchmaking
"The Omega Speedmaster 125 is a very special watch. Very few were made. Not only is it an automatic chronograph, but it also carries the certificate of the Swiss Institutes for Official Chronometer Tests. This means that along the will all the practical advantages of a true chronograph, the Speedmaster 125 has the uncompromising timekeeping efficiency of an official chronometer.
Omega has designed the Speedmaster 125 as a commemorative watch for it's 125th anniversary. It is the latest in the Speedmaster line, the most distinguished family of the watches in Omega's history."

-- Excerpt from the Omega Speedmaster 125 Instruction manual


 (Quotation Courtesy of Simon Debrux)


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Main features of the Speedmaster 125

-- Diagram inspired by one in the original manual

Three position signed Omega crown:
Position 1 (normal operating position):
For occasional rewinding of the watch if it has not been warn for 48 hours or more.
Position 2 (For Instant Date Setting):
Pull crown out to position 2 and turn the crown clockwise until the date indicated in the calendar window (4 in diagram at left) is correct. Note: Before you try to set the date, make sure that the time on the watch is between 3 o'clock and 8 o'clock so that you avoid binding the automatic date change mechanism with the quick change mechanism.
Position 3 (Time Setting):
Pull crown out to position and turn the crown until both the main dial hands (1: Hour, 2: Minute) and the 24-Hour arrow (5) are properly set.
Other items indicated in this diagram:
1: Hour Hand, 2: Minute Hand, 3: Second hand (in sub-register at 9 o'clock), 4: Calendar Date window, 5: 24-Hour Arrow, 6: Chronograph Second Indicator, 7: Chronograph Minute Indicator, 8: Chronograph Hour Indicator. Pusher A: starts and stop's and restarts the Chronograph, Pusher B: Resets the Chronograph after the Chronograph has been stopped.


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Description: Allows one to compute speeds and machine outputs.
Examples of Use:
1) To calculate the speed of a car over a known distance press the top chronograph button when entering the fixed distance press it again when the fix distance. If the time elapsed is 45 seconds the second hand points to the figure 80 on the Tachy scale. If the fixed distance is a Kilometer then the car is traveling 80 kilometers per hour. If the distance covered is a mile, then the speed is indicated in Miles per hour.

2) To calculate the output of a machine, start the chronograph and count a set number of units made, at the end of this number stop the chronograph. If you counted to 1,000 and the second hand points to 75 on the Tachy ring, the machine's hourly output is 75 time 100 or 7,500 units per hour.


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Description: The Telemetric scale is graduated to indicate the speed of sound in air. This allows the user to calculate the distance between the observer and a situation that is observable both visually and audibly.

Description of Operation:
On an optical signal, start the chronograph. When you hear the sound stop the chronograph. The number indicated at the distance in kilometers or miles (depending on scale).
Examples of Use:

At the flash of a bolt of lightning start the chronograph. Stopping the chronograph when you hear the thunder (in the case of the diagram at left at 5 Seconds) will indicate on the Telemetre ring 1.6 km or 1600 meters away from the wearer of the watch. Sounds like a good time to take cover! =)


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Description: The Pulsimetric scale is graduated to indicate the rate of respiration or pulse of a patient. This allows the user to take a pulse or observe a certain number of respirations and read off the correct number of respiration/pulse per minute.

Description of Operation:

The top chronograph button is pressed at the beginning of a pulse or respiration, it is pressed again when the proper number of pulsations/respirations has occurred. The proper number of pulsations is indicated on the bezel dial.
Examples of Use:

At the start of a pulsation the operator starts the chronograph, after the 15th pulse the operator stops the chronograph at 18 seconds. Reading from the stopped second hand to the Pulsimetric scale results in a pulse rate of 50 beats per minute for this patient.


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Description: For industrial timing, statistical analysis, calculation of averages and cost prices the use of decimal division of time is common.

Examples of Operation:
To measure the length of time it takes to perform any operation start the chronograph when work begins and stop it when the work on the second piece begins. This results in the amount of time to produce a piece.
Examples of Use:

If a worker is fitting a bracelet to a watch, an observer starts the chronograph when the worker begins on a unit to be assembled and stops it when the worker begins on the second unit. The time read off the bezel indicates the time this operation took in hundredths of a minute, in the diagram at left 0.28 minutes per piece.

Omega flightmaster:

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Scans from a c.910 Flightmaster instruction manual:

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(information courtesy of Stuart Tentoni)
Produced by people with their feet firmly on the ground.

It's easy to produce a chronograph with a revolving bezel and then call it a pilot's watch.

It's not so easy to produce a functional chronograph specifically for the pilot.

Before we even started to design the Flightmaster we researched the needs of the pilot and then we made sure that we covered those needs - no more, no less.

The result is the combined effort of designers already experienced in producing chronographs for the aviation world; and Omega - supremely experienced in the production of precision timepieces which have proved reliable even in the extreme conditions of space travel.

Every part of the Flightmaster has been carefully considered and the chronograph born of the research design and development is a practical instrument - specially made for the pilot.

The Case:  

Cut from a single block of Swedish stainless steel, the upper case is pressed and tempered sixteen times before it assumes it's unique elliptical shape designed to fit the countours of the wrist comfortably.Normally, the Flightmaster is equipped with a stainless steel bracelet. But it also comes with a Corfam® strap. The strap has cool "air-conditioning" holes and is designed with the anatomy of the wrist in mind to assure a firm and comfortable fit necessary with a watch of the Flightmaster's proportions.

Water and Spaceproofing:
After the movement has been inserted into the case and the stainless steel back screwed into place, the tempered mineral glass crytstal is sealed in position by a unique jointing system.

It has been tested under space conditions and works even in a complete vacuum

A pilot's watch has many functions so the visual aspect of the Flightmaster is a particular feature.

Designed for legibility the time zone hand have been carefully placed to avoid confusion with the whole face colour keyed to strengthen the visual separation.

Even the winders and pushpieces have been keyed to the face and although the red chronograph hands are supplied as standard, the Flightmaster is on special request available with yellow hands to allow for where aircraft cabins are lit with infra-red light.
The Movement:
The same people responsible for the timeing devices used in the Olympics and by the American astronauts are responsible for the Flightmaster so you knoiw that each of the moveing parts is a piece of precision engineering designed for accuracy and total reliability.

Overall usage... The basics:

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Click to enlarge photos...

Chronograph Operation:

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Click to enlarge photos...

GMT or Multiple Time Zone Operation:

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Click to enlarge photos...

Operation of the undercrystal Bezel:

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Click to enlarge photos...


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I'd like to thank Simon Debrux of the United Kingdom (Speedmaster 125), Heng van de Weg of the Netherlands (Mark V), Stuart Tentoni of the U.S.A. (flightmaster) for their contributions to the scans presented here. The scans for the Mark III are from an instruction manual from my personal collection... I would also like to thank John Diethelm of Omega Switzerland for his ceaseless efforts in assisting the Omega community to learn more about their watches.

Statement of permissions/Rights Retained...

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As the source materials of these scans have no copyright expressed on them, I consider them in the public domain. So they may be used freely. However... it is always morally, ethically, legally and polietly important that these scans not be used fraudulently or be misrepresented as genuine documents... It occurs to me that someone with a talent with Desktop publishing tools could use these scans to produce convincing replicas of original documents. Please don't... It is also a common courtesy to inform people whom you print out copies of these scans of the source of these documents. I and the other people who have contributed these materials in good faith would appreciate your respecting the spirit of these thoughts. The commentary within this document is reserved by the author.

That's it. I think it's fair enough...


-- Chuck