Converting Rolex Caliber 1570/1575 to GMT – A Vintage Challenge

The Rolex Caliber 1570 and its GMT counterpart, the 1575, are beloved among collectors and watch enthusiasts for their durability and historical significance. If you own a vintage Rolex with the 1570 movement and wish to add GMT functionality, here’s a guide to transforming this classic movement into a dual-time masterpiece.

The Legacy of Caliber 1570

Introduced in 1965, the 1570 is a workhorse movement that powered many iconic Rolex models, such as:

  • Submariner 5512 and 1680
  • Explorer 1016
  • Datejust models (1600, 1601, 1603, etc.)
  • Date models (1500, 1501, etc.)

Certified as a chronometer, the 1570 features 26 jewels, a bi-directional rotor, and a Breguet hairspring. Its successor, the Caliber 1575, added GMT functionality, allowing for the tracking of an additional time zone.

Parts Required for the GMT Conversion

To convert a Caliber 1570 into a GMT-ready 1575, these components are essential:

  1. Date Indicator Seating (Part 7965): Required to accommodate the GMT mechanism.
  2. Hour Wheel with Double Toothing (Part 8032): Allows for independent adjustment of the GMT hand.
  3. Mounted Date Wheel (Part 8034): Adapted for GMT functionality.

The Conversion Process

The modification process involves replacing the original components with the parts listed above. It’s critical to ensure precise alignment and calibration to maintain the movement's accuracy and reliability. While the procedure is straightforward for experienced watchmakers, sourcing genuine or high-quality aftermarket parts can be a challenge.

A Vintage GMT Masterpiece

Once completed, the modified 1570 movement transforms your vintage Rolex into a functional GMT timepiece, blending historical charm with added utility. At OLD-CROWNS.COM, we specialize in sourcing premium replacement parts for vintage Rolex models. Let us help you bring your vintage GMT vision to life!

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