Info

grail-watch.com    Extensive watch movement database; all major brands

beyondthedial.com    Great and useful website publishing in-depth articles on famous and lesser known brands

theseikoguy.com    Comprehensive website from Andrea Secco. Much about Grand Seiko, Divers, old catalogues etc. 

thegrandseikoguy.com   Comprehensive website about Grand Seiko. Much info, old catalogues etc. 

watchhunter.org    This site contains a survey of old Seiko catalogues. Here's a link

plus9time.com    Lots of information on modern and vintage Seikos

chronomaddox.com    Omega production dates. 

speedmaster101.com    Lots of info on the Omega Speedmaster.

oysterinfo.de    General information about Rolex Oyster watches. Very informative. 

minus4plus6.com    Production dates and reference numbers of Rolex Oyster models. 

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

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