For any of those who handle watch repairs…what do you consider an
acceptable timing accuracy you expect from your watchmaker?
Particularly for old mechanical or automatics?
1 min/day? 2? 3?
For any of those who handle watch repairs…what do you consider an
acceptable timing accuracy you expect from your watchmaker?
Particularly for old mechanical or automatics?
1 min/day? 2? 3?
I do not repair watches, as a long time fine watch aficionado I can
share some thoughts.
The watch accuracy not necessarily depends on a watchmaker but on a
watch itself. This of course should be taken with provision that
watchmaker is properly trained and followed all required steps in
watch maintenance. If the watch is certified chronometer, then it
must conform to the COSC standard. Here is the link for more info
http://www.cosc.ch/chronometre.php?lang=en
If not than it is really difficult to say whether watchmaker did
something wrong or simply the mechanism start showing it age.
Leonid Surpin
Hi Neil,
For any of those who handle watch repairs...what do you consider an acceptable timing accuracy you expect from your watchmaker? Particularly for old mechanical or automatics?
What do you mean by ‘accuracy’? Do you mean regularity of rate in
positions, regularity in wear, ability to show the same time as
another timepiece, ability to compensate for temperature changes?
The short answer is that it depends on the type of watch, its quality
and age… When I restore an 18th century watch I am normally happy if
I get better than 5 minutes per day on timekeeping against a radio
controlled master clock and ± 2 minutes between different static
positions. For a modern watch I would expect to better 30 seconds a
day on rate even on a fairly mediocre watch with maybe ± 10 seconds
maximum difference between positions. However, the age of the watch
and its escapement will have some bearing on the accuracy you can
expect. These rates are also usually only measured in a static
condition, while the watch is standing on a bench, hanging on a hook,
laying on a timing machine etc. and do not reflect the timekeeping in
everyday use where movement of the wrist and knocks and bangs may
affect the timekeeping. Another factor which could come into play is
the ‘settling in’ of the movement again after servicing. When the
lubricant is changed and the mechanical parts are disturbed by
disassembly it takes a little while for the parts to ‘bed in’ again
and so the time keeping can change a little over a matter of days or
even weeks. For this reason it is normal to make the watch run a
little fast to compensate for the loss of initial ‘life’ in the oils
A quartz watch should have a daily error of no more than 10 seconds
but a rate of 2 or 3 seconds a day error shold be easily achievable
depending again on the quality of the watch and whether it has any
means of adjustment available or not - many cheap watches are
non-adjustable…
Best wishes,
Ian
Ian W. Wright
Restorer of fine and complicated watches and chronometers.
Sheffield UK