Is the Accuracy of a Master Co-Axial the same as a Master Chronometer?

mrmahdi · Oct 5, 2019

Greetings,

I have an Aqua Terra 150 that is a master co-axial. From what I gather it has the 8500g movement which is basically the same as the 8900 movement but with the METAS certification.

So does that mean that a master co-axial has the same accuracy as a master chronometer?

Archer · Oct 6, 2019

Not the same specs. 8500G is measured over 5 positions, with an average daily rate tolerance of -1 to +6 seconds per day over those 5 positions.

The 8900 is measured over 6 positions, with an average daily rate tolerance of 0 to +5 seconds per day over those 6 positions.

larryganz · Oct 8, 2019

I think that he meant, "can or will the master co-axial typically be or often be as accurate as the master chronometer?"

watch72 · Oct 8, 2019

Archer
...8500G is measured over 5 positions. The 8900 is measured over 6 positions...

Thanks for this good information.
Are the 5 positions in 8500 the same and covered in 8900?
If so, may I ask what is the 6th position of the 8900 and the significance of having this?
Sorry if I asked too many questions. There's so much to learn..

Archer · Oct 8, 2019

watch72
Are the 5 positions in 8500 the same and covered in 8900?

Yes.

watch72
If so, may I ask what is the 6th position of the 8900 and the significance of having this?

The position is with the crown pointing right as you look at the dial of the watch. It is also known as 12 high, as the 12 o-clock position of the dial would be pointing straight up.

The greater number of positions you check a watch over, the more difficult it is to keep the variation between positions smaller. It is a higher standard.

Is the Accuracy of a Master Co-Axial the same as a Master Chronometer?

mrmahdi

Archer

larryganz

watch72

Archer

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