Serial, case and movement numbers, if available, can assist in dating your timepiece and the authentication process when purchasing. Selected production date tables and serial number projects (where a site tries to aggregate serial numbers from visitors who submit watch information) are shown below. Please let me know if there are others we should include or there are resources with more accurate information.
Have not been able to locate information. Please contact me if you know of one.
Current Breitling reference model Numbers explained [The Unofficial Breitling Source]
Breitling Serial Numbers from 1944 [Brittons Watches]
Breitling serial numbers for chronograph and non-chronograph [WatchesToBuy]
Have not been able to locate information. Please contact me if you know of a third-party source of production information.
Gruen movement and case serial numbers [Gruen Wristwatches]
Heuer Chronograph Master Reference Table [OnTheDash]
IWC (International Watch Company)
IWC casing and movement numbers [Brittons Watches]
IWC Watch Serial Numbers [Elite Timepieces]
There are also IWC web apps that can help date a particular watch, see IWC Workbook Search and Date Your IWC
IWC serial numbers [Vintage Watch Restoration]
No public production date table known. Worth a try is sending a request (with the engraved number at the back of the timepiece, a picture of the front and back as well as the reference of the movement) to email@example.com (For Europe) and firstname.lastname@example.org (For the US).
You can receive production information by obtaining an extract.
Have not been able to locate information. Mido Watches will reply (usually) to requests for information, though it is rather hit-or-miss in terms of detail provided. Please contact me if you know of a third-party source of production information.
ilovemyspeedmaster (Moonwatch calibers 321, 861 and 1861 only)
Omega Speedmaster Evolution (Case, Calibre, and Serial Numbers) [Chronomaddox]
Omega Serial Numbers by Year [Chronomaddox]
Omega Vintage Watches [Omega]
Patek Philippe [Vintage Watch Restoration]
Rolex production dates [Oysterworld via Vintage Rolex Forum]
Rolex Case Numbers and Case Number Project (button at top, via Vintage Rolex Forum). Case numbers by production date are shown at the bottom of the ‘Rolex Serial Number Project’ button. [Vintage Rolex Forum]
Rolex serial numbers with production dates [QualityTyme]
And some bonus reading on bracelets:
The Fascinating (And Totally Geeky) Story Of The Rolex Oyster Bracelet [Hodinkee]
Rolex C&I Bracelets, USA Made Oyster and Jubilee Bracelets [Rolex Vintage Forum]
Tissot Serial Numbers
Tudor Serial Number Project (button at top, via Vintage Rolex Forum). This only includes the project information, held in Google docs format. [Vintage Rolex Forum]
Tudor serial numbers with production dates [QualityTyme]
Universal Genève Information [Dre on omegaforums] through 2.57.
Universal Geneve, as with most other manufactures, does not provide information on serial number dates (we are left to figure this out via known extracts) nor production figures.
The below table is one commonly found on the internet. However, I am unable to match the dates in this table against known production dates (from Vacheron) against a set of watches from the 1940s. I have not reviewed this table more widely against other references across time.
Vacheron Serial Numbers [WatchesToBuy]
There is an alternative Vacheron serial number table that some use. I have however, found the top table from publised at WatchesToBuy to be more accurate. If you find otherwise, please give me a shout.