Watches in general    Extensive watch movement database; all major brands    Great and useful website publishing in-depth articles on famous and lesser known brands

Seiko    Comprehensive website from Andrea Secco. Much about Grand Seiko, Divers, old catalogues etc.   Comprehensive website about Grand Seiko. Much info, old catalogues etc.    This site contains a survey of old Seiko catalogues. Here's a link    Lots of information on modern and vintage Seikos

Omega    Omega production dates.    Lots of info on the Omega Speedmaster.

Rolex    General information about Rolex Oyster watches. Very informative.    Production dates and reference numbers of Rolex Oyster models. 

Other    Serious Watches / online dealer of Orient, Nethuns (bronze) etc. 

Wesselink & Vreeker    Wesselink & Vreeker, Alkmaar. First-class Rolex and Omega service. Our watchmaker.