Unusual chapter ring markings - what do they mean?

I recently acquired a Nautec chronograph diver from SC. It has a pretty standard chronograph, day/date and diving bezel.

On the chapter ring it has the following numbers around the outside. 700, 360, 240, 180, 140, 120, 100, 90, 80, 70, 65 and 60. The 60 is located at the 6 o'clock position.

Can anyone tell me what these mean, please?

The sales thread is here, I hope AZTIME doesn't mind me stealing the pics
https://forum.tz-uk.com/showthread.p...ghlight=nautec

https://u.cubeupload.com/Aztime/9c9image.jpeg

Is it a reverse tach ring?

The ring is upside down, so you then use the "chequered" end of the second hand to use the tach scale, and the red end to measure seconds.

Just a thought?



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Looks like a tachymeter scale, but unusually oriented and presumably working in conjunction with the black and white striped hand.

EDIT: Ah it's the elongated end of the chrono seconds hand. Ingenious.

Now that we presumably know the "what", maybe someone can explain why ...

Thanks for the replies, I now need to look up what a tachymeter scale is/does!

It is very simple, you use the chronograph to time how long it takes to complete something.
The scale then tells you how many are completed in an hour.
So if you use it to time travel between two km posts on a french autoroute, and the answer is about 25 seconds, the stripey hand will be pointing to 140, you are travelling 140 kmh.
If your servant can fold a napkin into a swan in 35 seconds, he can do 100 in an hour.

And so on

Dave

Quote:

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Originally Posted by sweets

If your servant can fold a napkin into a swan in 35 seconds, he can do 100 in an hour.

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Haha, worth getting a chronograph with a tach just to find out.

Quote:

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Originally Posted by sweets

It is very simple, you use the chronograph to time how long it takes to complete something.
The scale then tells you how many are completed in an hour.
So if you use it to time travel between two km posts on a french autoroute, and the answer is about 25 seconds, the stripey hand will be pointing to 140, you are travelling 140 kmh.
If your servant can fold a napkin into a swan in 35 seconds, he can do 100 in an hour.

And so on

Dave

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Ta for this. The napkin example was especially enlightening.