Dandong Tongji 7120 Five-Pin 6-Point LB Moon Phase – Domestic Mechanical Watch Movement

1. Description

The Dandong Tongji 7120 Five-Pin 6-Point LB Moon Phase Movement is a high-precision, domestic mechanical watch movement that integrates rich horological tradition with modern functionality. Built for collectors, watchmakers, modders, and enthusiasts who appreciate detailed craftsmanship, this mechanical movement delivers outstanding performance, sophisticated functionality, and long-lasting durability.

Manufactured domestically using traditional Chinese horological engineering, this movement is based on the Tongji platform, an iconic foundation in China's mechanical watch industry. The 7120 movement is particularly notable for incorporating a moon phase complication, a rare and elegant feature that elevates any watch design into a high-end timepiece.

With five functional pins, a 6-point layout, and LB (lunar-based) moon phase display, this movement allows for versatile dial configurations while maintaining accuracy and mechanical integrity. Whether you're building a luxury dress watch, repairing a beloved timepiece, or assembling a bespoke custom design, this movement offers the essential structure and capabilities needed for professional watchmaking.

The moon phase complication, traditionally reserved for premium watches, visually tracks the waxing and waning of the moon — a feature revered for both its poetic charm and its complex gearwork. Combined with domestic production standards and proven mechanical design, this movement stands at the crossroads of affordability and horological sophistication.

Ideal for new designs or movement replacement in compatible watches, the Dandong Tongji 7120 movement brings history, innovation, and aesthetic finesse into one dependable platform.

2. Key Points

• ✅ Domestic mechanical movement based on the iconic Tongji design
  
• ✅ Five-pin functionality supporting multiple complications
  
• ✅ 6-point configuration layout for creative dial design
  
• ✅ LB moon phase display adds elegant astronomical tracking
  
• ✅ Stable frequency and accuracy suitable for daily use
  
• ✅ Perfect for repair, modification, or custom watchmaking
  
• ✅ High durability and component consistency
  
• ✅ Smooth mechanical operation and manual winding
  
• ✅ Standard size fits many domestic and custom watch cases
  
• ✅ Time-tested engineering with modern refinements
  

3. Benefits

A. Refined Domestic Craftsmanship

As part of China’s long-standing tradition of mechanical watchmaking, the Dandong 7120 movement represents a matured, well-balanced mechanical system trusted by professionals and hobbyists alike. It benefits from decades of development, improving on reliability and functional precision without sacrificing its classic core.

B. Moon Phase Elegance

Few complications in the world of watchmaking offer the same poetic grace as the moon phase indicator. With the 7120’s LB moon phase function, wearers can track the lunar cycle visually — adding romance and refinement to any timepiece. It’s a highly desirable feature, especially among watch collectors and design-focused users.

C. Customizable for Watchmaking Projects

Thanks to its six-point layout and five-pin output, this movement is an ideal base for modders, watchmakers, and microbrands looking to build unique, multi-function timepieces. Functions can be assigned to sub-dials, moon phase, and other watch features, depending on your design goals.

D. Proven Tongji Mechanical Platform

The Tongji series has been at the heart of China’s mechanical movement revolution since the 1970s. It is simple, reliable, and easy to maintain. The 7120 expands on this legendary platform with added complications, without compromising mechanical stability.

E. Repair and Replacement Friendly

Because the movement maintains a standard form factor, it can be used in repairs or restorations of watches that originally used similar platforms. This provides a cost-effective way to breathe new life into worn or non-functional timepieces.

F. Manual Winding Reliability

The manual winding design ensures a tactile and traditional experience, perfect for enthusiasts who appreciate mechanical craftsmanship. It eliminates dependence on batteries and electronics, reinforcing the movement’s independence and sustainability.

G. Affordable Luxury

Mechanical movements with moon phase functions are often confined to premium Swiss or Japanese watches. This domestic option offers comparable complexity at a fraction of the cost, opening up new opportunities for affordable high-end designs.

H. Low Maintenance, Long Life

The movement is designed for longevity and low-friction performance, requiring only occasional lubrication and standard mechanical upkeep. This ensures a long service life, even with daily wear.

4. Why Choose the Dandong Tongji 7120 Movement?

✔ Horological Heritage

This movement comes from Dandong, one of China’s most respected centers of mechanical watchmaking. When you choose the 7120, you're not just buying a component — you're investing in decades of horological history and refinement.

✔ Versatile Application

From restoration projects and boutique watches to educational builds and personal customizations, the 7120 is one of the most versatile mechanical movements available. It is well-suited to hobbyists and professionals alike.

✔ Elegant Functionality

The inclusion of the moon phase complication sets this movement apart. It introduces a layer of elegance and visual storytelling to any timepiece, creating not just a watch, but a piece of wearable art.

✔ Reliable Domestic Engineering

Unlike imported movements that may be hard to service or replace, the 7120 benefits from locally available parts, manuals, and technical support. This ensures future-proof repairs and continued use.

✔ Ideal for Collectors and Builders

Collectors appreciate the 7120’s mechanical purity and historical roots, while builders benefit from its flexibility and clean layout. It bridges the gap between utility and creativity in mechanical horology.

✔ Cost-Effective Upgrade Path

Adding this movement to a basic case transforms a standard watch into a sophisticated, multi-function timepiece, making it a perfect upgrade option for those enhancing entry-level mechanical watches.

✔ Enhances Value of Custom Watches

For boutique watchmakers and independent modders, using a moon phase movement like the 7120 can increase the perceived value of the finished watch without inflating material costs. It’s a smart choice for limited edition runs and signature designs.

5. Conclusion

The Dandong Tongji 7120 Five-Pin 6-Point LB Moon Phase Mechanical Movement is a masterclass in domestic horological innovation. Offering traditional mechanical engineering, poetic moon phase tracking, and a versatile output system, it gives designers and watch lovers everything they need to build meaningful, personalized, and enduring timepieces.

Whether you are repairing a cherished heirloom, building a custom moon phase wristwatch, or exploring the art of mechanical watchmaking, the 7120 movement is the perfect companion. It provides an affordable entry point into complex watch functions without sacrificing precision, quality, or visual appeal.

Durable, reliable, elegant, and historically rich — this movement is a testament to the growing capability of domestic mechanical engineering in the watch industry.

Let the Dandong 7120 bring your vision to life — one gear, one moon phase, one tick at a time.