Tudor Caliber 2671: A Compact Powerhouse for Precision and Elegance

The Tudor Caliber 2671 is a compact and reliable automatic mechanical movement, frequently found in smaller-sized Tudor watches—especially women's models. Manufactured by ETA SA Manufacture Horlogère Suisse, the movement is also known in the wider watch industry as the ETA 2671, a proven Swiss workhorse with decades of service in timepieces that demand dependable performance in a compact footprint. When used by Tudor, the movement is often modified and regulated to meet the brand's rigorous standards, offering enhanced durability and consistent accuracy.

Technical Overview

• Type: Automatic mechanical movement

• Diameter: 17.2 mm (7¾ ligne)

• Height: 4.8 mm

• Jewels: 25

• Power Reserve: ~38 hours

• Frequency: 28,800 vibrations per hour (4 Hz)

• Functions: Hours, minutes, central seconds, date display

• Winding: Bidirectional automatic rotor

The Caliber 2671 is widely admired for its blend of small size and functional robustness. Despite its modest diameter—ideal for compact or feminine cases—it houses a high-performance balance wheel and delivers a strong beat rate of 28,800 bph. This ensures a smooth second-hand sweep and precise timekeeping, which Tudor enhances further through fine regulation.

Heritage and Reliability

Tudor has a long-standing tradition of using modified ETA movements in its watches. The 2671 is no exception. This movement benefits from ETA’s heritage of reliability while being adapted to Tudor’s own specifications for enhanced performance and longevity. It offers hassle-free serviceability and is known for its excellent long-term stability, even under varied conditions.

This movement is found in watches like the Tudor Clair de Rose collection—a line aimed at women who want elegance, Swiss craftsmanship, and mechanical authenticity. Its thin profile allows it to fit into finely styled, smaller cases without sacrificing automatic capability or reliability.

Performance in Daily Wear

The Tudor Caliber 2671 performs exceptionally well in real-world conditions. The automatic winding mechanism is efficient thanks to its bidirectional rotor, and it maintains time within chronometer-like tolerances when properly serviced and regulated. The date function is also well-integrated, snapping cleanly into place at midnight without delay. The movement’s 38-hour power reserve may not match that of some modern in-house calibers, but it is more than adequate for everyday wear.

Its compact size is also advantageous from a design standpoint. It allows Tudor to produce thinner and more refined watches, often with a focus on elegance and discretion. Yet, the mechanical nature of the movement means these timepieces still appeal to enthusiasts who appreciate the craft of traditional Swiss watchmaking.

Serviceability and Modularity

One of the key advantages of Tudor using ETA-based calibers like the 2671 is the ease of service and the availability of parts. Trained watchmakers around the world are familiar with the movement’s architecture, making routine maintenance more accessible and often more affordable than proprietary, complex in-house mechanisms.

Conclusion

The Tudor Caliber 2671 may not grab headlines like some of the brand’s in-house calibers, but it plays a vital role in the brand’s lineup—particularly in delivering high-quality mechanical performance in compact, stylish formats. Its reliability, ease of service, and precise timekeeping make it a trusted choice for everyday luxury watches. Whether tucked inside a Clair de Rose or another elegantly understated reference, the 2671 proves that good things really do come in small packages.