Some tachymeter/telemeter/pulsometer watches highlighted spiral-type “snailed” scales around the dial. For that Chronoscope, Omega opted for a far more symmetrical look that features a couple concentric circles which include the crucial scale facts when also not materially distracting from core dial legibility. 6200 and ref. 6205. There is some dispute https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/