Watch Works: Duplex Swan-Neck Fine Adjustment

We’ve covered the essentials – and then some – in the Watch Works column by now. Time to take a closer look at some intricacies that can be found on certain watches that are worthy of a much closer look. 

For this addition to the Watch Works library, we are however not looking towards La Chaux de Fonds in Switzerland, but rather, to Glashütte in Germany.

The Duplex swan-neck fine adjustment.

This technical achievement is an innovation from Glashütte Original. It is based on the principle of the traditional swan-neck fine adjustment and – you guessed it – extends it by integrating a second swan-neck spring. 

And so if a swan-neck fine adjustment is used to finely regulate the rate of a watch, what does a second one bring to the table?

To understand that, it helps to know that they will both complement eachother, and improve the overall precision of the calibre. 

The Duplex swan-neck fine adjustment  is connected to the balance by means of the stud-holder and enables regulation of the anchor symmetry. Adjusting the adjustment screw allows one to turn the entire balance so that the impulse pin is centred in the anchor fork, which optimises the insertion of the pallets in the escape wheel. 

Thus on the right side one can regulate the rate (V/N) and on the left the anchor symmetry – for extreme precision. 

In a nutshell, the Duplex swan-neck fine adjustment essentially allows you to regulate both the beat and the rate of the calibre. Schön!

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