How to identify the movement inside any vintage Wittnauer chronograph: Venus 188, Valjoux 7733 and 7734, Landeron 248, and the house numbering system Wittnauer used to mark them.

Every dealer says never get a vintage watch wet. That advice is half-engineering and half-liability theater. Here is what is actually true about vintage water resistance, where water actually gets in, and when a 1965 diver is safer than a 2-year-old modern.

Bumper movements were the world's first commercial self-winding watches. Here is what they are, why collectors care, and which vintage bumpers are still worth buying.

Learn to identify any vintage watch by its case markings, movement, dial, and serial number, then determine its real market value. Brand-specific tips included.

Serial numbers, style numbers, case dating, and the triangulation method. A bench-level guide to dating vintage Gruen wristwatches from 1925 to 1958.

Date your Tudor watch using serial numbers from 1940 to 2002. Complete serial number chart, reference number decoder, and authentication steps.

Every Omega movement that left the factory in Bienne, Switzerland received a serial number. That number, stamped onto a bridge or plate...

Here's the honest truth that most watch sites won't tell you: there is no publicly available serial number table for Wittnauer watches....

Longines has been making watches since 1832, and they've been recording serial numbers for every single one since 1867. That's over 150...