Chronoswiss Caliber C 672

Chronoswiss Caliber C.672

Chronoswiss Caliber C 672

Brand Chronoswiss
Caliber Number C.672, C672
Base Caliber
ETA/Unitas 6497-1
Not the base; some modifications developed in-house
Movement Type Mechanical, manual-wind
Lignes 16.5”’
Beat Rate
18,000 vph, 2.5 Hz
Lift Angle
44 degrees (unconfirmed)
Power Reserve
48 hours (~2 days)
Balance Wheel
Glucydur with screws, three-sided
Balance Spring
Nivarox I flat balance-spring
Etachron with swan-neck fine-tuning device
Anti-Shock Device
Hand Count 3
Functions Central hours; central minutes; central sweeping seconds
Hacking Seconds?
Polished pallets, pallet wheel and screws; circular-grained bottom plate; bridges with Côte Genève; individually numbered
Country of Manufacture Switzerland, Swiss made
Known Models
Chronoswiss Timemaster (Refs: CH 6233 bk, CH 6233 LE bk, CH 6233 lu, CH 6233 LE lu – “LE” indicates destro models)

The Chronoswiss caliber C.672 is a custom hand-wound mechanical watch movement based on the ETA/Unitas 6497-1. This 3-handed, time-only caliber is found in the brand’s iconic onion crown model: The Chronoswiss Timemaster.

C.672 VS 6497-1 Specs:

As the C.672 is based on the framework of the 6497-1, they both share the same 36.6mm diameter and frequency of 18,000 vph. However, because of extensive modifications to the original architecture, the C.672 is a bit thicker in height at 5.4mm vs the standard 4.5mm of a stock 6497. Another difference is that the Chronoswiss has one extra jewel, bringing the total count to 18 compared with 17 in the base movement.


In addition to the specs above, the C.672 also features customizations not found on the stock 6497-1 base. For example, the 6497-1 is a non-hacking movement, whereas the C.672 has a custom stop lever for hacking the movement. Also, while the base 6497-1 has a small seconds subdial at 9:00, Chronoswiss has modified the movement to have a central sweeping seconds hand. This is mostly what causes it to be almost 1mm thicker. A swan neck regulator was also added for extra fine-tuning capability.

Chronoswiss Caliber C672 Macro Chronoswiss Caliber C672 Swan Neck

Movement Text:

Text on the cal. C.672 reads: CHRONOSWISS / ACHTZEHN 18 STEINE / SWISS MADE / No. 1111.

There is a Chronoswiss CRL logo etched into the ratchet wheel. This logo is said to represent the brand’s founder’s initials: Gerd-Rüdiger Lang.

The ETA stamp can be found below the balance wheel as usual.

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