The Tissot caliber 11.7 is a manual-winding mechanical movement produced in the 1930s and 1940s, during an era when Tissot was establishing itself as a major innovator in affordable yet high-quality Swiss timepieces. This caliber predates the more standardized 20xx and 27xx movement series and is part of Tissot’s early generation of numbered calibers developed in-house. The 11.7 was commonly used in men’s and unisex watches, particularly in mid-size and dress models.

Overview of the Tissot Caliber 11.7

The Tissot 11.7 was designed for time-only watches and typically includes:

• Manual winding mechanism

• Hour and minute hands

• A small seconds subdial at 6 o’clock

It was fitted into round cases, often between 30 mm and 34 mm in diameter—relatively modest by modern standards but suitable for the time. These watches were made from nickel alloy, stainless steel, or gold-plated brass, and frequently bore the Tissot Antimagnetique label, reflecting the movement’s magnetic resistance.

The 11.7 was also part of Tissot's early drive to integrate anti-magnetic materials, setting it apart from many competitors in the same price range.

Technical Specifications

• Type: Manual-winding

• Functions: Hours, minutes, small seconds

• Jewels: 15 (typical configuration)

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

• Power Reserve: Around 36–40 hours

• Diameter: ~26 mm (about 11.75 lignes, hence the name)

• Height: ~3.5–4 mm

• Shock Protection: Not standard in early examples; some later models may feature rudimentary protection

• Finish: Swiss traditional finishing with matte bridges, blued screws, and Tissot engravings

The 11.7 is built with a Swiss lever escapement and features a clean, open movement architecture, making it relatively straightforward to work on despite its age.

Maintenance and Servicing

Given its age, the Tissot 11.7 requires careful handling and regular servicing every 4 to 6 years. Many watches with this caliber have not been serviced in decades and may need restoration.

A full service typically involves:

1. Complete disassembly of the movement

2. Ultrasonic cleaning of all parts

3. Detailed inspection of gears, pivots, and balance assembly

4. Replacement of worn components, usually from donor movements

5. Lubrication with modern synthetic oils

6. Reassembly and precise regulation

7. Case polishing and gasket replacement (if gaskets exist)

Due to its vintage status, parts may be rare, so experienced vintage watchmakers are recommended for any work.

Common Wear Points

• Mainspring fatigue, causing low power reserve

• Balance pivots and jewels—common failure points if lubrication is dry

• Seconds wheel teeth may be worn or bent

• Keyless works can become stiff or worn due to decades of winding

• Caseback threads and crowns often suffer from corrosion or wear

Nevertheless, the movement’s construction makes it resilient and worth restoring, especially in historically interesting models.

Handling Tips

• Wind daily, stopping at the first sign of resistance

• Keep dry, as early cases are not water-resistant

• Avoid magnetism, as this can dramatically affect timekeeping

• Store dial-up in a dry place, preferably in a vintage-style watch box or pouch

Collectibility and Appeal

The Tissot 11.7 holds considerable appeal for vintage collectors due to:

• Its pre-war mechanical heritage

• Solid performance for a movement of its time

• Use in early Tissot Antimagnetique models

• Historic value as a forerunner to Tissot's later movement lines

Though not as widely known as later calibers, it offers a true vintage experience for collectors interested in 1930s–1940s Swiss horology.

Conclusion

The Tissot caliber 11.7 is a classic example of early Swiss mechanical ingenuity—compact, robust, and designed with functional elegance. As one of Tissot’s foundational movements, it played a key role in the brand’s development into a respected global watchmaker. When properly serviced and preserved, the 11.7 continues to deliver reliable performance with timeless charm, making it a rewarding choice for vintage watch enthusiasts.