Some tachymeter/telemeter/pulsometer watches featured spiral-model “snailed” scales around the dial. To the Chronoscope, Omega opted for a more symmetrical look that contains a couple concentric circles that include the essential scale info although also not materially distracting from Main dial legibility. The advent of the primary Submariner Date, the 1680, https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/