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.
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.