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.
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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