Here is a complete maintenance guide for the Tissot caliber 6952, a manual-winding chronograph movement from the 1970s, based on the Lemania 1873 platform. It is a highly respected, cam-lever chronograph known for its durability, mechanical simplicity, and widespread serviceability. Proper care will ensure its long-term accuracy and reliability.

Overview of the Tissot 6952

• Base movement: Lemania 1873

• Type: Manual-wind chronograph

• Complications: Central chronograph seconds, 30-minute counter at 3 o’clock, small seconds at 9 o’clock

• Used in: Tissot chronographs from the 1970s, often with sporty or racing-style dials and cases

Recommended Service Interval

• Every 4 to 6 years for standard wear

• Sooner if: The chronograph pushers feel sticky, the reset is not accurate, or timekeeping becomes inconsistent

What Full Maintenance Includes

Performed by a professional watchmaker:

1. Disassembly

   • Full breakdown of the movement, including chronograph components

2. Cleaning

   • Ultrasonic cleaning of all movement parts to remove dirt, dried oils, and metal particles

3. Inspection

   • Check for wear on the chronograph levers, cams, clutch, mainspring, and pivots

4. Lubrication

   • Proper application of high-grade modern oils and greases at designated points

5. Reassembly

   • Correct assembly of the chronograph mechanism, ensuring smooth pusher function and alignment

6. Timing Adjustment

   • Regulation in several positions to maintain chronometric performance

7. Case Resealing

   • Replacement of caseback gasket, crown seal, and pusher gaskets (if available) to help preserve dust and moisture resistance

Common Wear Areas

• Chronograph cam and reset hammer: Can become worn or misaligned

• Operating levers: May lose spring tension over time

• Clutch wheel: Can slip or engage unevenly if dry or worn

• Pushers: Gaskets deteriorate and may cause stiffness or leakage

• Main spring: Loses torque and reduces power reserve with age

Handling Best Practices

• Always stop the chronograph before resetting to avoid damage

• Avoid over-winding; stop when resistance is felt

• Do not expose to moisture unless the watch has been recently resealed

• Keep away from magnets such as speakers, phone cases, or clasps

• Store the watch in a dry, temperature-stable environment

Who Should Service It

• A qualified mechanical watchmaker with experience in vintage chronograph movements

• Ideally familiar with Lemania 1873-based calibers, which include Omega 861 and Tissot 873/6952

Summary

The Tissot 6952 is a robust and well-engineered manual chronograph movement that performs reliably when properly maintained. Regular servicing every few years, gentle handling, and professional care will keep it in excellent condition. Given its heritage and mechanical pedigree, it remains a strong example of 1970s Swiss chronograph design.