Some tachymeter/telemeter/pulsometer watches featured spiral-fashion “snailed” scales on the dial. To the Chronoscope, Omega opted for a far more symmetrical glimpse that incorporates a couple of concentric circles that come with the important scale facts when also not materially distracting from core dial legibility. Similar to the ref. 6536 over, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/