Some tachymeter/telemeter/pulsometer watches highlighted spiral-style “snailed” scales to the dial. To the Chronoscope, Omega opted for a far more symmetrical seem that features a handful of concentric circles which include the vital scale details when also not materially distracting from Main dial legibility. Similar to the ref. 6536 earlier mentioned, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/