Longines relaunched the Ultra-Chron in 2022. It is a near-perfect revival of the high-frequency range that first appeared in the 1960s. We saw a vintage Ultra-Chron on one of our recent expeditions to an Antiques and Collectors Fair. There wasn’t a known service history for this particular example, so it wasn’t purchased. However, it did…Read more
Category: Frequency
Mechanical watch movement frequency
Frequency is a term that is used regularly in these pages when discussing the specifications of watch movements. Movement frequency in a mechanical watch refers to the number of oscillations or vibrations the balance wheel makes per hour. It’s typically measured in Hertz (Hz) or vibrations per hour (VPH) or beats per hour (BPH). For…Read more