Tachymeter

Its tachymeter function used to convert time intervals to speed or rates of events is etched around the rim of the analog face. ❋ By Michael S. Lasky (2008)

Ok, so there is a difference between tachometer and tachymeter. ❋ Unknown (2005)

Features a cool dark blue dial, Japanese Miyota movement, tachymeter scale, and a silver/black bracelet. ❋ Unknown (2010)

Features scratch resistant and anti-reflective crystal, tachymeter scale around the bezel and is water resistant to 100 meters. ❋ Unknown (2010)

Hodinkee: "In 1972, Heuer launched a promotion with the Viceroy brand of cigarettes to sell a distinctive self-winding caliber 12 Autavia with a black dial, red hands, and a tachymeter bezel (like on the Siffert Autavias) for $88 to those that sent in one carton end flap." ❋ Unknown (2010)

With a stopwatch, date display, tachymeter and chronograph dials, how does it look this good? ❋ Unknown (2010)

The tachymeter scale can be used to compute the speed - between 60 and 330 km/h - travelled over one kilometre. ❋ Unknown (2010)

Introduced in 1960 and named for the Daytona International Speedway, it retains most of its original features (three chronographic subdials and a tachymeter on the bezel), though it's now driven by a spankin'-new movement. ❋ Unknown (2009)

Features a stainless steel case, swiss quartz movement, water resistant up to 50 meters, and tachymeter. ❋ Unknown (2009)

But, hey, for that you get all kinds of fancy features, including a tachymeter scale, automatic chronograph and, I'm sure, a really snazzy box.

This isn't just any ordinary bezel however, as it has been outfitted with a useful tachymeter for calculating speed over a measured distance. ❋ Unknown (2009)