Some tachymeter/telemeter/pulsometer watches showcased spiral-model “snailed” scales around the dial. For the Chronoscope, Omega opted for a far more symmetrical appear that contains a couple of concentric circles that come with the significant scale information even though also not materially distracting from Main dial legibility. Tag Heuer Carrera 'Glassbox' Chronograph https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/