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Grade 992B with letter 'C' preceding the serial number. Please keep in mind that this table is in a ‘draft’ form and may change. This table is for the 405 and 425 based calibers and is a guide for determining the approximate date of manufacture of a movement. Serial Number to Date Table for Gruen 405, 410, 420 & 425 caliber families

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So if your Elgin watch has a serial number starting with a letter, you must determine the millions digits from the table below in order to determine the full serial number.

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Rolex Serial Numbers from QualityTyme.In the 1930s, Elgin began using a single-letter prefix to replace the 'millions' digits on their serial numbers.

Elgin Serial Numbers from The Watch Guy.

Elgin Serial Number Database from The Elgin Watch Collectors Site.

Elgin Private Label Watch Database from John Fogarty.

Elgin (National) Watch Co Production Dates from PocketWatchSite.

Columbus Watch Co Production Dates from PocketWatchSite.

Dating Chelsea Clocks by Serial Number by Bob Setnik, Adobe Acrobat 10KB.

Bulova Serial Numbers from The Watch Guy.

Dating Big and Baby Ben's by Bill Stoddard and Richard Tjarks, Adobe Acrobat 26KB.

Gruen Watches, New Method for Dating Your, from.

Some Observations Regarding the Dating of Gustav Becker clocks Using Serial Numbers, from Clockaholic.

Ball Watch Co Production Dates from PocketWatchSite.

Dating Your Atmos Clock from Atmos Clock Repair.

Dating the Atmos by Mike Murray, Adobe Acrobat 18KB.

Historical Timeline of Vienna Regulators from SN Clocks.

Identification of Comtoise from l'Horloge Comtoise Ancienne.

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How To Date Your Grandfather Clock from Andrew Clayton Clock Repair.

Dating French Clocks by Scott Dean, Adobe Acrobat 808KB.

Swiss Movement Identification, downloadable books by Horloger-Rhabilleur.

Serial Number Production List for several U.S.

Popular Watch Crown Styles by Denis Carignan.

The Labels & Printers Project, for early American clocks: use the printer on the label to date the clock.

How to Determine the Age of a Watch by Kevin James.

Introduction Dates of Some Popular Antique Clock Styles, Antique Clocks Identification and Price Guide.

Vintage & Antique Pottery Marks of France from China Chat.

Swiss Hallmarks, and Other Swiss Case Marks by David Boettcher.

Look for your Mark, silver and porcelain marks from Kovels.

Porcelain and Pottery Trade Marks from The Arlecchino Antique Shop.

Online Encyclopedia of Silver Marks, Hallmarks & Makers' Marks.

French Limoges and Sevres Marks from China Chat.

Fake and Pseudo Hallmarks by David Boettcher.

British Import Hallmarks in Watch Cases by David Boettcher.

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National Association of Watch & Clock Collectors, free for members.

Watch Movement Identification by David Boettcher.

Trademarks of German Clocks & Watches by Volker Vyskocil.

Terry Type Wood Movement Identification (excel spreadsheet) by Dr Snowden Taylor, 1.7MB.

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Swiss Watch Code Initials by Mike Murray, Adobe Acrobat 409KB.

Swiss Poinçons de Maître by David Boettcher.

Japanese Clock Logos, extensive listing of Japanese clock manufacturers and their logos.

Identifying your American Pocket Watch at.

Horological Trademarks, by The Horological Foundation, search horological trademarks, stamps & signatures.

German Makers' Trademarks by Hans-Heinrich Schmid at more than 1,000 marks.

Database of Antique Clock Clockmakers' Names and Dates, Antique Clocks Identification and Price Guide.

Horological Trade Mark Index from Mikrolisk.

Identification of Watch and Clockmakers.

Tips on how to identify your Attleboro Clock Co.

How to identify French Mantel Clocks at Our Pastimes.

How to identify an original Simon Willard clock by Ben E Fulbright, Adobe Acrobat 23KB.

Vintage and Antique Watch 'How to' Information by Renaissance Watch Repair, provides a large amount of info on identifying, dating, evaluating vintage pocket watches.

Vienna Regulator Styles, by Phil Rasch, published on SNClocks.

Just What Is A Railroad Watch? by Kent Singer.

Identifying Vintage Clocks Depending on Vital Attributes from Ezine articles.

How do I find out about the maker of my antique clock? from Brian Loomes.

Identification of British Clock Types from Brian Loomes.

How to Identify Antique Clocks from Hunker.

Antique Clocks Identification and Price Guide.

Identification of Types Identification of Makers Identification Services Dating of Timepieces Bottom

Sources for Fabrication of Movement Parts.

Estimated Mainspring Length and Thickness.

Sources for Case, Dial, & Tablet Restoration.