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Tudor Revive ‘Big Block’ with Prince Chronograph One for Only Watch 2023

Tudor Prince Chronograph One Only Watch 2023 9420 801

Among Tudor collectors, Big Block chronographs are grails. Among everyone else, they’re still some of the coolest chronographs of the 70s, as expected of the first Tudor automatic chronograph. Now, for the 2023 edition of the Only Watch Charity Auction and to raise money for research into Duchenne Muscular Dystrophy, the Swiss watchmaker is recapturing that collector-centric hype with the Tudor Prince Chronograph One.

Tudor Prince Chronograph One Only Watch 2023 9420 801

Tudor Prince Chronograph One Only Watch 2023 9420 801

On the surface, the appeal to the unique piece is obvious. It’s a gorgeous, 70s flavoured gold chronograph, relatively substantial at 42mm, with a classic tri-compax layout. Equipped with a black and gold tachymeter bezel, it’s as racey as it is elegant. The dial echoes the scheme in black lacquer with sunken subdials. It’s gorgeous. But the Tudor Prince Chronograph One also has something more impressive about it: the movement.

Tudor Prototype column-wheel Manufacture Chronograph Calibre MT59XX

Unique watches are the name of the game for Only Watch, but unique movements? That’s something else entirely. Specifically, the Tudor Prince Chronograph One houses the Prototype column-wheel Manufacture Chronograph Calibre MT59X. Specs-wise it has a 70-hour power reserve and an accuracy of -2/+4 seconds per day. The movement has been entirely developed in house and marks a new era for Tudor watchmaking. That makes this prototype a genuine piece of modern watchmaking history and means its CHF 25,000 estimate feels very low.

Perhaps more importantly, this might just indicate a grand return of the legendary Big Block. Here’s hoping… after all, this unique piece is a bit out of reach for most of us.

Price & Specs:

  • Model: Tudor Prince Chronograph One
  • Ref: 9420/801
  • Case/dial: 42mm diameter, 18k solid yellow gold case, unique black dial printed “Prince Chronograph”, 18k yellow gold hour markers and hands
  • Movement: Tudor prototype calibre MT59XX, automatic
  • Power reserve: 70h
  • Functions: Hours, minutes, seconds, chronograph
  • Strap: 18k yellow gold three-link bracelet with 18k yellow gold Tudor T-fit clasp
  • Price/availability: Estimated CHF 25,000 – 35,000

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About the author

Sam Kessler

Legend has it that Sam’s first word was ‘escapement’ and, while he might have started that legend himself, he’s been in the watch world long enough that it makes little difference. As the editor of Oracle Time, he’s our leading man for all things horological – even if he does love yellow dials to a worrying degree. Owns a Pogue; doesn’t own an Oyster Perpetual. Yet.