How is the "Tachymeter" of a watch used?

ramonromero_mx

New member
I bought this nice watch because of its looks. It has this FIXED crown which reads "Tachymeter" on it, with numbers all around the front face of the watch. The crown has a "60" mark aligned with the 12:00 mark, then a "700" on the 1:00 mark, "350" on the 2:00 mark and so on, with decreasing numbers as you go clockwise. The numbers are NOT evenly distributed (for a reason maybe) as there is a "120" on the 6:00 mark and then finally a "65" on the 11:00 mark. Again, the crown is NOT rotating. It is FIXED.

I have seen this type of crown on other watches but I just don't know how it is used. I know it is meant to measure time in some way, but no one so far has been able to give me a CLEAR and SIMPLE example of how this "Tachymeter" can be used. I know some cars also have tachymeters which basically show the rotation speed of the wheels, in order to prevent the wheels from rotating too fast. On the watch, however, I just don't know how to read the numbers on the crown. I just guess the marks are use in combination with the chronometer feature of the watch and/or the seconds ticker somehow.

Could anybody help me and finally explain how this watch Tachymeter is used? I would appreciate a clear example of practical use. Thanks.
 
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