The Tissot caliber 6942 is a vintage manual-winding chronograph movement from the 1970s, developed during the period when Tissot operated under the SSIH group alongside Omega. Like its closely related counterparts—the 873, 6952, and 871—the 6942 was built on the solid foundation of the Lemania 1872/1873 family, known for reliability, simplicity, and longevity. Proper maintenance of the 6942 is essential to ensure precise chronograph function, consistent timekeeping, and long-term durability.

Overview of the Tissot 6942

The caliber 6942 features a bicompax chronograph layout, typically with a 30-minute counter at 3 o’clock and continuous running seconds at 9 o’clock. The central chronograph seconds hand provides elapsed timing functionality. It is a manual-wind movement, meaning it must be wound by hand daily if worn regularly. This movement is highly regarded for being both serviceable and resilient, making it a favorite among vintage chronograph enthusiasts.

Watches using the 6942 often have sporty or racing-inspired styling, reflecting the design trends of the 1970s. These watches were typically cased in stainless steel and featured bold dials, tachymeter scales, and large pushers—features that remain attractive to collectors today.

Service Interval and Importance

A movement like the 6942 should be fully serviced every 4 to 6 years, regardless of whether it is running or stored. Over time, oils inside the movement dry out, leading to increased friction, wear, and eventual malfunction. Neglecting regular maintenance can cause damage to key components, particularly the chronograph mechanism, which includes intricate levers, cams, and hammers.

If the watch shows signs such as inaccurate timekeeping, skipping chronograph seconds, pushers sticking, or inconsistent reset behavior, it is time for a full overhaul.

What a Full Service Includes

A qualified watchmaker performing a full service on the Tissot 6942 should do the following:

1. Disassemble the movement completely, separating each component, including the chronograph module.

2. Ultrasonically clean all parts to remove dirt, dried lubricants, and debris.

3. Inspect each part for wear, including pivots, wheels, cams, levers, and the mainspring barrel.

4. Replace worn components with new or donor parts, particularly critical items like clutch wheels or hammer springs.

5. Lubricate the gear train and chronograph interface points with correct oils and greases.

6. Reassemble and calibrate both the timekeeping and chronograph systems.

7. Regulate the movement for accuracy in multiple positions.

8. Replace seals and gaskets, especially around the pushers and crown, to protect against dust and moisture.

Common Points of Wear

Despite its strength, the Tissot 6942 is a mechanical device and has vulnerable areas that require attention:

• Chronograph reset hammers and cams can wear or misalign, leading to improper hand alignment on reset.

• The horizontal clutch mechanism can slip if lubrication is poor.

• Pushers can become stiff due to degraded seals or debris buildup.

• The mainspring may lose tension over time, reducing power reserve.

• The balance wheel and pallet fork require inspection for poise and lubrication.

Handling and Storage Tips

To prolong the life of the movement between services:

• Always stop the chronograph before resetting. Resetting while the chronograph is running can damage the mechanism.

• Wind the watch at the same time daily, and do not over-wind. Stop as soon as resistance is felt.

• Avoid exposure to moisture or magnetic fields. Even if the case is stainless steel, the seals may no longer be effective unless replaced.

• Store the watch face-up in a dry, temperature-stable environment when not in use.

Conclusion

The Tissot caliber 6942 remains a fine example of mid-20th-century chronograph engineering. Built on a respected Lemania platform, it combines reliability with mechanical elegance. Proper maintenance through regular servicing, careful handling, and preventive care ensures the movement will remain accurate and functional for decades to come. Whether in daily use or part of a vintage collection, the 6942 rewards attention with enduring performance and mechanical charm.