History of the Omega Constellation
Born in 1952, the Omega Constellation embodies the brand's pursuit of precision. From the pie-pan dial and C-Shape case to the electronic models of the 1970s, we look back at...
Watchmaking tools
Dating a vintage watch, preparing for a timegrapher check: we provide online tools designed for collectors, enthusiasts, and watchmakers.
The serial number decoder estimates the production year of an Omega, Tudor, Breitling, Longines or IWC from its serial or movement number. The lift angle decoder provides, caliber by caliber, the value to enter on your timegrapher to obtain a reliable amplitude measurement.
Where can I find the serial number of a vintage watch?
Depending on the brand and era, it is generally engraved on the movement.
Is the year obtained correct?
This is an estimate. The number most often corresponds to the manufacture of the movement: the watch may have been assembled or sold a few months, sometimes even a few years later. For precise dating, some brands provide an extract from the archives.
Which marks can be dated?
The decoder now covers Omega, Tudor, Breitling, Longines and IWC. Other brands will be added gradually.
Lift angle: what is this value used for?
The lift angle is the arc traversed by the balance wheel while its pallet stone is engaged with the anchor fork. The timegrapher needs it to calculate the amplitude, a key indicator of the movement's condition. Since this value varies from one caliber to another, an approximate setting compromises the measurement.
What if I leave my timegrapher's default setting?
Most devices default to 52°. If your gauge has a different angle, the displayed range will be inaccurate, either too high or too low. The stroke and the gauge mark deviation, however, do not depend on this setting.
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