The greater volume of space inside the barrel can accommodate a longer mainspring, which results in an additional gain of 10 hours of running autonomy. The oscillations occur under a stable bridge with greater impact resistance, an optimized height-adjustment system, and new integrated protection for the balance wheel.Īt the other end of the energy chain, highly accurate mechanical processing enabled Rolex to achieve a 50-percent reduction in the thickness of the barrel’s wall. The balance oscillates on a staff with a new geometry, offering greater resistance to magnetic fields, and is protected by Rolex’s Paraflex anti-shock system. Highly precise mechanical processing has improved the adjustment of the balance by a factor of three.Ĭaliber 3235 has a blue Parachrom hairspring with Rolex curve and a balance with Parallax shock absorption. The balance can be finely adjusted by turning four gold Microstella nuts along its rim. This little spring, which has been proven to remain stable despite temperature fluctuations and shocks, ends in an optimized Rolex overcoil and is mounted on a large balance with variable moment of inertia. This is also true of the blue Parachrom hairspring, which “breathes” inside Caliber 3235 and is made from a niobium-zirconium-oxygen alloy. Moreover, fabrication from a nickel-phosphorous alloy assures that the Chronergy escapement is insensitive to magnetic interferences. And the contact surfaces of the escape wheel teeth have been doubled. The ruby pallet stones have been thinned to 125 micrometers, a 50-percent reduction compared to the previous ones. The escape wheel is skeletonized to lighten its weight and reduce its inertia. Rather than being arranged in a continuous line, as in the past, the elements of the escapement are now set on an angle, which results in greater leverage. The remaining lion’s share of the increase was achieved by changing geometries. This accounts for nearly half the boost in the movement’s running autonomy, which now far surpasses Caliber 3135’s 48 hours Caliber 3235 amasses a power reserve of approximately 70 hours. The Chronergy escapement increases the efficiency of the Swiss lever escapement by 15 percent.
The Chronergy escapement has an angled orientation, a skeletonized escape wheel, smaller rubies and larger contact surfaces. It performs its practical purpose thanks to its magnifying effect and the anti-reflective treatment on both its surfaces. The Cyclops magnifying lens above the date window wasn’t added to the Datejust until 1954. A smooth, polished stainless-steel bezel surrounding a flat pane of sapphire seals the case from above. Our Datejust’s newly designed Oyster case has a middle piece milled from a single block of 904L stainless steel.
Gold Oyster cases have two dots on the crown to indicate the presence of the Twinlock system, while platinum cases have one dot. A line under the Rolex logo on the winding crown of our steel Datejust shows that our test watch has the Twinlock system. Two insulators help ensure watertightness: one is located in the winding crown while the other is situated inside the tube.
The Twinlock system’s interplay with the Oyster case guarantees that the Datejust can resist pressure up to 10 bar, which corresponds to the conditions at a depth of 100 meters below the water’s surface. The Datejust 41 has a smooth bezel and an easy-to-use Twinlock crown. This is characteristic of the Twinlock system, which Rolex invented in 1953.
Screwing the crown shut again is very secure, with a noticeable spring resistance.
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The seconds hand can be stopped at the full minute easily because the screw-down crown’s stem is inserted into a long tube and the unscrewed crown is easy to grasp. The hands move with no play whatsoever, so the minutes hand can be positioned with its tip perfectly tangent to the desired index. The winding stem engages securely in each position so the time can be reset precisely.
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The ergonomic improvements that Rolex made to this caliber, in the interface for making manual adjustments, are very noticeable in practice. Simply pull the crown out to its middle position, turn it counterclockwise, and the date advances smoothly and accurately. Thanks to a movable finger in Rolex’s new automatic Caliber 3235, which powers the Oyster Perpetual Datejust 41 we’re reviewing here, the date can be reset manually, quickly, and whenever desired.
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