Certina Caliber 25-66M

Brand	Certina
Caliber Number	25-66M
Movement Type	Manual wind, mechanical
Diameter	11.5”’ (25.6mm)
Thickness	3.85mm
Jewels	17
Lift Angle	50 degrees
Power Reserve	42 hours
Vibrations Per Hour	19,800 bph
Balance Staff	U2822
Hairspring	Flat
Hands	1.50 / 0.90 / 0.18
Anti-Shock	Incabloc
Features	Hours, minutes, sweeping seconds
Country of Manufacture	Switzerland
Production Years	1970s
Known Models	Certina Club 2000

The Certina caliber 25-66M was in production between 1975-1977. This movement was produced in Solothurn, Switzerland.

The movement pictured above was found in a vintage Certina Club 2000 watch.

From wahawatches.com:

All the Certina in-house movements that I’ve encountered are great performers and you can accurately regulate them with the micro-regulator.

There is also a similar Certina caliber 25-66 which is almost identical to the caliber listed here with the exception of the balance wheel having 2 spokes (instead of 3 spokes on the 25-66M variant). You may also see a caliber 25-661 which adds a calendar complication.

Certina was founded in 1888 in Grenchen, a municipality of Solothurn, Switzerland. The company is now part of the Swatch Group conglomerate and watches are still being made under the Certina name. Find examples of modern Certina watches here.

• Certina official site
• Certina Wikipedia page

Please share your experiences and thoughts about the caliber 25-66M in the comments section below…

Caliber submitted by wahawatches.com