Speaking of things you’ll never see on a Rolex, at least not one made of steel, is a display caseback. This Tissot has one, allowing you to view the Valjoux A05 automatic chronograph calibre that ...

The 18-karat-gold Day-Date, for instance ... including raising the retail cost of the Rolex Daytona chronograph in white gold to about $49,300 (£38,700) from $46,000 (£37,200).

Zenith just unveiled a duo of cool chronographs as part of LVMH Watch Week. That includes a model set with rainbow-coloured gemstones and a skeletonised version of its Defy Skyline Chronograph.

At the top of that pile is unquestionably the Rolex Daytona. Once the ugly duckling ... so called because it was the first automatic chronograph movement used on a commercial wrist watch.