The Heuer 915 is a mechanical chronograph movement produced by Heuer, known for its robustness and reliability. This caliber played a significant role in Heuer’s lineup during the era when mechanical chronographs were highly valued for their precision and craftsmanship.

Technical Specifications

• Type: Manual-winding chronograph

• Diameter: Approximately 29.3 mm

• Height: Around 7.3 mm

• Jewels: Typically 17 to 21

• Frequency: 18,000 vibrations per hour (2.5 Hz)

• Functions: Hours, minutes, small seconds, chronograph with 30-minute and 12-hour counters

• Power Reserve: Approximately 42 hours

Design and Engineering

The Heuer 915 is based on the classic Valjoux 7750 architecture but represents an earlier design with manual winding instead of automatic. It features a column wheel or cam-actuated chronograph mechanism depending on the variant, providing reliable and precise chronograph functions.

The movement is designed for durability and ease of maintenance, with components arranged to facilitate servicing. Its construction ensures smooth operation of the chronograph pushers and consistent timekeeping performance.

Applications in Watchmaking

The Heuer 915 was widely used in various Heuer chronograph models, especially in the 1960s and 1970s. It powered several iconic timepieces known for their racing heritage and sporty design.

This caliber was favored for its mechanical reliability and straightforward design, making it a preferred choice for watches requiring robust chronograph capabilities with manual winding.

Maintenance and Longevity

Due to its traditional design and use of quality materials, the Heuer 915 is considered durable and maintainable by experienced watchmakers. Replacement parts are generally accessible due to the movement's relation to common chronograph calibers of the era.

Regular servicing ensures that watches equipped with this caliber continue to operate reliably for decades.

Conclusion

The Heuer 915 remains a respected manual-winding chronograph movement, valued for its mechanical robustness and classic design. It holds an important place in Heuer’s history, representing the brand’s commitment to precision and performance in mechanical timekeeping, especially within the racing and sports watch categories.