Bell & Ross Vintage 123 Pink Gold Jumping Hour
© Bell & Ross
Jumping hours (“Heures Sautantes”) is the name for digital hour indication on the dial.
In a small window, usually at the top of the dial, there is a disc with the hour numerals, which is advanced jumping every hour.
A. Lange & Söhne Zeitwerk with digital jumping hour and minute display.
© A. Lange & Söhne
Analogous to jumping hours, but referring to the second hand, which then moves forward every second. (In watches with conventional balance frequency, e.g. 28,000 A/h, the hand moves in fractions of a second). The display of a hand advancing by seconds requires more constructive effort.
See: Dead-beat seconds