How Accurate Are NOMOS Watches? A Watchmaker Explains
Posted on July 15 2026
Roldorf Field Notes
The NOMOS Field Guide · Chapter 03
How Accurate Are NOMOS Watches?
A watchmaker explains mechanical accuracy, positional variation, regulation, and how every new NOMOS sold by Roldorf is tested before delivery.
The accuracy of a mechanical watch cannot be understood through one number alone.
A watch may gain time in one position, lose time in another, and behave differently depending on how fully it is wound, how active its owner is, and how it rests overnight.
That is why we do not judge a NOMOS from a quick glance at a timegrapher. We look at the watch as a complete mechanical system and assess how it performs across the positions it may experience in real ownership.
Mechanical Reality Accuracy is a range, not a single fixed number
A quartz watch uses an electronic oscillator and is generally expected to remain extremely close to the displayed time. A mechanical watch measures time through a balance wheel, escapement, gear train, mainspring, and dozens of interacting components.
Small changes in friction, lubrication, position, temperature, winding state, and motion can influence the rate.
That variation is not automatically evidence of a fault. It is part of the nature of mechanical timekeeping.
A mechanical watch is judged by the consistency of its behaviour, not by one isolated reading.
The Measurement What a timegrapher actually tells us
A professional timegrapher listens to the movement and converts the sound of the escapement into several useful measurements.
Rate
The estimated number of seconds the watch may gain or lose over twenty-four hours in the position being tested.
Amplitude
The extent of the balance wheel’s swing. It helps the watchmaker understand the energy reaching the regulating organ.
Beat error
The difference between the balance wheel’s swing in one direction and the other. Excessive beat error can indicate that adjustment is required.
Trace quality
The stability and clarity of the timing trace can reveal irregularity that a simple daily-rate number may conceal.
Positional Variation Why the same watch gives different readings
Gravity affects the balance assembly differently as the watch changes position. For that reason, the rate measured dial-up may not match the rate measured crown-down.
This is why a single dial-up test cannot describe how a watch will behave on the wrist.
The useful question is not whether every position produces the same number. The useful question is whether the differences are controlled, understandable, and capable of producing acceptable overall performance in normal ownership.
Horizontal positions
Dial up and dial down often produce relatively stable readings because the balance staff is supported differently than in vertical positions.
Vertical positions
Crown-up, crown-down, and other vertical orientations may reveal larger differences and are especially useful when assessing positional performance.
Roldorf Preparation Every new NOMOS is tested in six positions
Before a new NOMOS leaves Roldorf, we run a six-position timing sequence:
Dial up, dial down, 12 high, 3 high, 6 high, and 9 high.
This provides a much more useful picture than one quick reading. It allows us to compare horizontal and vertical performance, look at positional spread, and identify whether regulation is appropriate before the owner receives the watch.
When adjustment is necessary, it is carried out before delivery. The customer receives a printed report documenting the assessment.
This process does not turn a mechanical watch into a quartz instrument. It does mean the watch begins its ownership with known, examined performance rather than an assumption.
What Roldorf checks before delivery
- Rate in six positions.
- Positional variation.
- Amplitude and beat error.
- Trace stability.
- General winding and setting function.
- Regulation when the results indicate it is appropriate.
- A printed timing report for the owner.
On the Wrist Laboratory readings and real life are not identical
A timegrapher measures the watch in a controlled position over a short period. An owner wears the watch while walking, working, driving, resting, and sleeping.
The watch may spend much of the day in changing vertical positions and then rest dial-up overnight. Those different rates can partially cancel one another or combine in a way that changes the observed daily result.
Automatic watches introduce another variable: activity. A watch worn by a very active owner may remain at a different winding state than the same watch worn by someone who spends most of the day at a desk.
This is why meaningful diagnosis begins with how the watch is actually being used.
Regulation When a healthy watch can still benefit from adjustment
Regulation changes the rate of a healthy movement. It does not replace a full service and it cannot correct wear, contamination, dried lubrication, damage, or insufficient amplitude.
A watch may be a good candidate for regulation when its trace is stable, amplitude is appropriate, beat error is controlled, and the movement’s condition does not suggest a deeper problem.
If the underlying movement is unhealthy, simply changing the rate may conceal the symptom without correcting the cause.
Good regulation begins with diagnosis. The goal is not merely a prettier number.
Owner Observation How to assess your NOMOS at home
Owners can learn a great deal by comparing their watch against a reliable reference once per day at approximately the same time.
Record the difference over several days rather than resetting the watch after every observation. A longer pattern is more useful than one unusually good or bad day.
Use a stable reference
Compare the watch with a reliable time source and record the difference in seconds.
Keep conditions consistent
Note how long the watch was worn, how it rested overnight, and whether activity was unusual.
Look for a pattern
Several days of consistent behaviour are more useful than one isolated result.
Do not chase perfection
Mechanical ownership becomes frustrating when every second is treated as evidence of failure.
When to Seek Help Sudden change matters more than a stable personality
A watch that has always gained a small, consistent amount may simply have a stable rate that can be understood or regulated.
A sudden change is more important. If the watch begins gaining or losing much more than usual, stops unexpectedly, shows a sharp reduction in power reserve, or behaves erratically from day to day, it should be inspected.
Magnetism, impact, moisture, winding problems, ageing lubrication, and mechanical wear are among the possibilities. Diagnosis should determine which one is actually present.
The verdict
NOMOS watches are capable of strong, consistent mechanical performance, but they should not be judged as though they were quartz instruments.
The most meaningful assessment considers rate, amplitude, beat error, positional variation, winding state, and the owner’s real pattern of use.
At Roldorf, every new NOMOS is assessed in six positions before delivery, adjusted when necessary, and supplied with a printed timing report. That gives the owner a documented starting point and access to watchmakers who can reassess or regulate the watch later.
Mechanical accuracy is not the absence of variation. It is controlled, understandable performance from a movement that can be maintained throughout a lifetime of ownership.
The Roldorf Ownership Advantage
Buy from people who test the watch before handing it to you.
Every new NOMOS sold by Roldorf is assessed by a watchmaker before delivery, with ongoing timing checks, regulation support, authorized service, and long-term ownership care.
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