Frederique Constant - Highlife COSC Certified 18MM Fold Over Clasp with Push

Fold Over Clasp with Push Button Case Size 25mm Case Material Two-Tone Stainless Steel Crystal Mineral Crystal Water Resistance WR

Case Diameter: 40

Dial Color:Black

Design to fit : Tudor Heritage 79220

Frederique Constant - Highlife COSC Certified 18MM Fold Over Clasp with PushRarely are watches certified by the COSC (Official Swiss Chronometer Testing Institute). This certificate is only issued to pieces that can guarantee perfect isochronism over a given time and at given positions in effect, their ability to tell the time correctly, consistently and precisely, within the strict limits enforced by an ISO standard. The COSC is an independent Swiss organisation that only issues its chronometer certificates to these pieces