Don't worry, I've been there...from either not enough coffee, too much beer, or both! 😀
I use mine at work quite a bit. The reasons why, I cannot speak of.
861’s time to a 5th. 321 time to a 4th.
I have spent 60 years at auto race tracks, watching, spannering, driving, holding out pit boards, waving flags. Also rallying: driving, navigating, marshalling, mechanicing, organising, watching. All but the first 10 years as a teen and pre-teen with no watch at all was with a chronograph on my wrist and I have never found a use for a tachy scale in any of these activities.
There is just one use I can think of for a tachy scale at a race track -- the special watches that Heuer made for the Indianapolis track where the readout was in mph for a full lap.
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That watch must be a tad old. Indy cars lapped faster than 175 nearly 50 years ago.
And so they did. Graham Hill in a Lotus / Pratt & Whitney managed 172mph in 1968. At those speeds hand timing should have been too inaccurate and those watches were museum pieces. So was the engine after USAC bowed to pressure.
Still, the watches would be nice to own.
Would you say a black face is the most popular on the Speedmaster?