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
In-House?
Not the base; some modifications developed in-house
Movement Type Mechanical, manual-wind
Lignes 16.5”’
Diameter
36.6mm
Height
5.4mm
Jewels
18
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
Regulator
Etachron with swan-neck fine-tuning device
Anti-Shock Device
Incabloc
Hand Count 3
Functions Central hours; central minutes; central sweeping seconds
Hacking Seconds?
Yes
Finishing
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.

Customizations:

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.

Additional Resources:

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