1603 ‘Prototype’ Datejust

In the late 1960s, Rolex began exploring fresh design horizons. Instead of using their in-house dial-makers, they commissioned Singer – a Swiss firm celebrated for crafting the iconic “Paul Newman” Daytona dials, to produce concept dials that pushed aesthetic boundaries. Among these design experiments was a standout dial for the Datejust series: the rare “block‑marker” prototype dial, AKA the “Singer block markers” dial. This dial features elevated, mirrored-rectangular indices that reflect light, shifting between black and silver tones and lending a dynamic, expressive personality to what is typically a restrained classical dial.

Make no mistake about it, this is an ultra limited production: Only a few specimens of these dials have been discovered, most of which are manufactured for solid references such as the 1601 and 1603 Datejust. Collectors estimate that there are fewer than ten genuine pieces known today. This wasn’t retail­-ready stock – it originated from Singer’s internal concept catalog and was accepted by Rolex for limited issue. Genuine examples reveal the “Singer” mark stamped on the back of the dial – a seal of heritage and provenance. The chunky, mirrored “block‑marker” indexes are matched with a silver/champagne colored pie-pan canvas. The effect? A wristwatch that’s not only effortlessly vintage but visually alive, with the mirrored block-markers responding to light and motion with hypnotic reflection. It’s no museum piece – it’s a living artifact from a chapter where Rolex flirted with the avant-garde, guided by Singer’s creative spark, and only a few fit this description anywhere in the world. This 1603 “Prototype” Datejust was hand‑picked through our close-knit network, fully serviced, verified and completely checked out.

Bottom line: This isn’t just a Datejust – it’s a Museum-grade prototype, ultra-rare design, and vintage icon – perfectly in harmony with WatchWork’s passion for extraordinary (Datejust) timepieces. Fully serviced by expert hands, she will be delivered with our extensive two years of mechanical warranty.

reference: 1603
case number: 174XXXX
year of production: 1967
case diameter: 36mm
movement: self-winding, Rolex caliober 1570
box and papers: no

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