#Rotary watch manuals professional#
The movement requires professional service.Of course, there are reasons to cause a watch to be unduly fast or slow.Ī few of the reasons why a watch may be fast: Well, simply put: This is absolutely impossible! It is a scientifically proven fact that isochronism (consistent oscillation) cannot remain constant in a wearable watch. That’s when my customers usually disagree: „But my neighbor tells me that his Rolex has been 100% accurate for five years with no time deviations ever”. The general rule for mechanical watches is that a deviation of 10 seconds or less per day is good. Over two months this variation accumulates, and that watch will be 8 minutes fast (8 s/d x 60 d = 480 s = 8 minutes). For example, the timegrapher detects a deviation of +8 seconds per day (this is considered good accuracy for a mechanical watch). First of all, a claim about a 10-minute delay or advance on the watch has to be put into perspective and interpreted correctly by the watchmaker. I haven’t tried this yet, as if it doesn’t do that, it means going round the date circle a further twelve times to get back to the right month, a real drag.Is your watch gaining or losing time every day? Very often when a customer comes to us, the reason is an inaccurate running of their watch. What would be really useful would be if when the push button is depressed, winding the date past 31 did NOT advance the month. The (commercial) seller of the watch told me that when depressed, the button allows the month to be set, but I have not been able to achieve this. There is also a push button on the perimeter of the case at 2 o’clock, but I haven’t been able to make it do anything at all. Presumably day-of-the week is set by rotation of the hands, and I have found out that the month advances each time the date is turned past 31. With the winder pulled fully out, only the hands are moved, forwards or backwards. Pulling out the winder halfway allows you to set the date if turned in one direction and the moon-phase in the other. I have recently acquired a modern (quartz) Rotary moon-phase watch, and I would appreciate some advice about setting it.Īs you'll see, the watch has three inner dials – day of the week at 9 o’clock, date at 12, and month at 3, and a moon-phase window at 6 o’clock.