Rolex has always been known for producing high-quality, reliable movements. We only need to browse the brand’s current movement list to see that quality and function have been the top priority of Rolex mechanical engineering for decades.
Introduced in 1988, the 3135 movement is the main movement behind many models and a solid foundation for building complex movements such as the second time zone and the day of the week calendar. However, in recent years, the 3135 movement has gradually retreated to the second line, and accordingly the 32xx series has begun to shine. It is reported that the 31xx movement will be completely replaced by the 32xx series in the next few years, completely withdrawing from the stage of history. But long ago, before the new movement came on stage, Rolex relied on the 15xx series to ensure accurate timekeeping.
Rolex 1575 movement
In terms of automatic movements, the Rolex 1575 stands out from the rest. It is abrasion-resistant, robust and elegant, making it an excellent timekeeper. Interestingly, these movements will be sent to COSC for testing after they have been thoroughly overhauled and left the Rolex Service Center, and they can still keep the daily error within -2 / + 2 seconds. This was a technical feat for the movement produced in that era.
Rolex 1575: A Brief History
The 1575 movement came out in the mid-1960s. As a movement, its history is not grand. Rolex produced the 1575 movement because it needed a robust and reliable automatic watch. The 1575 movement also successfully completed its mission.
The 1575 movement is an improvement from the 1560 movement. The 1560 movement has a vibration frequency of 2.5 Hz and a power reserve of 44 hours. On the basis of this, the 1575 movement has increased the vibration frequency to 2.75 Hz and added the stop-second function. .
Rolex 1575 movement: specifications
The 1575 movement has a diameter of 28.2 mm, contains 25 gems, has a date display function, and is equipped with a winding spring. Because functionality is the top priority in the designer’s mind, retouching is not worth a special book. The substrate has a spotted pattern, while the bridge is decorated with light particle patterns.
Functionality and ease of repair are the highlights of the 15xx series. The barrel of the barrel is sturdy, but not bulky, and it can accommodate the barrel below. The wheel train bridge also incorporates all wheel trains into tight protection.
It is particularly noteworthy that the escape wheel has a shock-absorbing function. This function is most commonly used for balance wheel pivots, but is not unusual for escapement wheels. There are other brands of watches, but they are relatively rare, and they are only found on the back side of the watch, indicating that for display purposes, they have more functions. In the Rolex 1575 movement, the escape wheel can be seen from the dial and both sides of the case back. The escapement wheel pivot is in good condition and the extra protection undoubtedly played a positive role. Today, most Rolex caliber escapement wheels are equipped with shock absorbers.
The balance wheel is equipped with a star-shaped fine adjustment screw, and the nut can be turned clockwise or counterclockwise as needed to adjust the balance inertia and watch speed. The 1575 movement uses a non-clamping balance, which eliminates the need for adjusting pins (fast and slow hands). The adjusting pin achieves the purpose of changing the vibration period by controlling the effective length of the hairspring. This system has certain defects. If the watch is impacted, the adjustment pin may be displaced, which will cause the travel time error. There is no adjustment pin on the cardless balance wheel, and adjustment is achieved by relying on its own moment of inertia, so this problem does not exist.
The weight of the oscillating weight is large enough to complete the winding task. The oscillating weight rotates around the central axis (instead of ball bearings) and is held in place by two rubies to reduce friction and improve performance. This design can also be seen in Rolex 30xx and 31xx series movements. In addition to the pendulum and escapement wheel suspension, the 15xx series of instant jump calendar functions have also been used by Rolex to this day.
First, let’s clarify a problem. Please note that the 1575 movement only has the basic time and date display function; accordingly, the 1575GMT movement has the GMT time display function. In addition, when disassembling a watch equipped with the 1575 movement, you may find that ‘1570’ is marked on the movement bridge. This situation is not necessarily incorrect, it is just what happened in that era.
The date changes at midnight, with the help of cams, springs, and gems for a snap jump. There is a cutout on the cam with a gemstone embedded. When the time comes to midnight, the lever connecting the gemstone is forced to jump into the cam cutout, so that the date changes exactly at midnight.
Rolex 1575 movement: conclusion
The 1575 movement is definitely the one that is popular with watchmakers. This movement is relatively easy to manufacture and maintain, it can still stand out decades after its production, and it will never be boring.
The 1575 movement is also a consumer-friendly movement. It has remained accurate and stable for years after leaving the factory. The 1575 movement may not be the most elegant or visually attractive movement in history, but as long as it involves performance requirements, it is always perfect.
Rolex 1575 movement
Year of production: 1965-1981
Vibration frequency: 2.75 Hz (19,800 times / hour)
Diameter: 28.2 mm
Thickness: 6.3 mm
Gems: 25 pieces
Power: 48 hours
Function: Central hours, minutes, seconds, date display