Some tachymeter/telemeter/pulsometer watches highlighted spiral-style “snailed” scales on the dial. With the Chronoscope, Omega opted for a more symmetrical look that includes a number of concentric circles which include the essential scale data while also not materially distracting from Main dial legibility. You should note that starting up in 2005, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/