Some tachymeter/telemeter/pulsometer watches featured spiral-model “snailed” scales to the dial. For your Chronoscope, Omega opted for a far more symmetrical search that contains a couple concentric circles which include the essential scale info while also not materially distracting from Main dial legibility. Hodinkee Skinny, handsome and brimming with ’60s panache, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/