ah ok. And what do those numbers mean? In terms of what they represent vs the other examples? Why have they changed that? and to clarify, when I meant by ‘strange’ is that the spacing between the measurement points and the sequencing of the numbers seemed odd. Most others I’ve seen have a relative scale and consistent spacing and number Increment. Assuming of course the sweeping seconds hand goes smoothly around at a constant rate. So there must be functional reason that explains that I expect? I don’t follow F1 (“sport”) so maybe that's where the answer lies. I doubt it will be used to time artillery shelling.