What is considered good accuracy for a mechanical watch?

A certified watch will be accurate to a bare minimum of +6/-4 seconds per day, and will generally be accurate to +/-3 seconds per day. A non-certified watch, meanwhile, will typically be accurate to about +/-5 seconds per day.

How many seconds a day should an automatic watch gain?

Generally, the accuracy of a standard self-winding movement is +-25 seconds per day, so should only gain or lose 25 seconds over two days.

How much time should a mechanical watch lose?

The general rule for mechanical watches is that a deviation of 10 seconds or less per day is good.

Are mechanical watches more accurate?

Mechanical watches are, in a word, outdated. They’re less accurate than a battery-powered quartz watch. The best mechanical watches are within a few seconds of accuracy, but still may lose 5-10 seconds a day. Quartz watches, on the other hand, are perfect by design, and may only lose about 4 seconds a month.

Do mechanical watches slow down?

Mechanical watch movements are affected by the pull of gravity and can therefore be sped up or slowed down depending on the position of the movement relative to the Earth.

Why are mechanical watches not accurate?

Modern quartz/battery operated watches are generally more consistently accurate than mechanical wristwatches. Quartz watches are typically accurate to +/-1 second per day….

Modern Mechanical non-COSC Certified watch
Excellent	+/-3 seconds per day	99.996\% accuracy

Is a mechanical watch better than quartz?

In terms of accuracy, it doesn’t get much better than a quartz watch. That’s not to say that mechanical watches aren’t accurate. To add some context to our first statement, a mechanical watch will lose between 5 and 10 seconds per day, while a quartz watch will lose around 4 seconds per month.

Why are mechanical watches inaccurate?

Mechanical watch parts are metal and slightly expand and contract with changes in temperature, and this influences accuracy. Normally, under high temperatures, a watch tends to lose time, and under low temperatures, it tends to gain time.

How often do mechanical watches lose seconds per day?

To add some context to our first statement, a mechanical watch will lose between 5 and 10 seconds per day, while a quartz watch will lose around 4 seconds per month. For a detailed look at how quartz watches manage to attain such a high level of accuracy, check out this informative article courtesy of Explain That Stuff.

Are mechanical watches accurate?

That’s not to say that mechanical watches aren’t accurate. To add some context to our first statement, a mechanical watch will lose between 5 and 10 seconds per day, while a quartz watch will lose around 4 seconds per month.

How fast is too fast for a mechanical watch?

Over two months this variation accumulates, and that watch will be 8 minutes fast (8 s/d x 60 d = 480 s = 8 minutes). The general rule for mechanical watches is that a deviation of 10 seconds or less per day is good.

What is a good time deviation for mechanical watches?

The general rule for mechanical watches is that a deviation of 10 seconds or less per day is good. 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”.