Some tachymeter/telemeter/pulsometer watches showcased spiral-style “snailed” scales to the dial. To the Chronoscope, Omega opted for a more symmetrical glance that contains a couple of concentric circles which include the essential scale info even though also not materially distracting from core dial legibility. Later on examples can be found inside https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/