Some tachymeter/telemeter/pulsometer watches featured spiral-fashion “snailed” scales on the dial. For your Chronoscope, Omega opted for a far more symmetrical search that contains a number of concentric circles that come with the crucial scale information though also not materially distracting from core dial legibility. Tag Heuer Carrera 'Glassbox' Chronograph I https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/