Let’s get one thing out of the way first. The watch dial format with Roman numerals at 1, 2, 11 and 12, and Arabic numerals at 4, 5, 7 and 8 is universally known as a California dial. But that’s not its original title.
When Rolex invented the design during World War II as an unmistakable way to orient and read a military watch dial at a glance under wartime conditions, it was officially called the Error-Proof dial.
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The highly legible dial design first appeared on a Rolex before being adopted by Panerai, using dials manufactured by the Crown. Tudor used the Error-Proof dial for decades in the Ranger and Oyster Prince collections, but it disappeared for over a decade.
Now, it’s back with the debut of the new Monarch collection, a sporty design with a faceted 39mm steel case and a dial inspired by Rolex’s original Error-Proof design from the 1940s.
