Some tachymeter/telemeter/pulsometer watches highlighted spiral-design “snailed” scales around the dial. For your Chronoscope, Omega opted for a more symmetrical seem that includes a handful of concentric circles which include the important scale info even though also not materially distracting from Main dial legibility. Age and Rarity: Vintage or limited edition https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/