Rotating bezel on my watch a tachymeter?

On my watch the fa bezel rotates and i have heard that it is used as a tachymeter. I dont recollect if this is true and if it is how do i use it?...


The watch pictured does not have a tachymeter. The bezel dial is toughened as a count down timer. You would rotate the dial to the desired number of minutes good old days the current time, and...

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