What is a “hack” seconds feature?
This, AFAIK, is a military term referring to watches that stop the second hand, to allow for more accurate synchronization between two watches. In the most common type of hacking watch, when the crown is pulled out to the time-setting position, a lever is moved which contacts the rim of the balance, thus causing the movement to stop. John Davis has seen other methods used to stop the movement as well, including brakes on the third or fourth wheel. A. Lange & Sohne have produced a watch that stops the balance when the crown is pulled out and automatically moves the second hand to the “0” position – to help facilitate setting against an accurate time reference.
