3 Answers

When it was link unveiled in 2010, the A. Lange & Sohne 1815 Chronograph ref. 402.026 represented the link second generation of the 1815 Chronograph, following the inaugural example's 2004-to-2008 link run. Arguably more focused and refined than its predecessor, this is the most recent white gold production example within the 1815 Chronograph.

One method was to make link a test balance which beats at the correct frequency which you use to check the performance link of the balance spring and balance combination of a production watch. Once link the approximately correct frequency was obtained the final adjustment of frequency and rate was via the balance spring fine regulator and adjustment of timing weights on the balance rim.