Even watches from the same brand often have different ways of determining age depending on the era in which they were made. Luckily we live in the age of the Internet and also have access to some great books, so there is hope. Here you can find technical and date information on literally thousands of movements, including details such as movement size, hand size, and lists of other variations in the same movement family.
Another great source is the Pocket Watch Database. Extensive gallery of photos to help you identify your watch visually. Also includes photos of vintage advertising and catalogs to help you learn more about watches in your collection.
So L5 would be and M7 would be WatchOPhiliia has a detailed article on other ways to identify the ages of various Bulova models. The Elgin Watch Serial Number database makes it simple to find the age of your watch. Just enter the number, and it responds with whatever information it has, includes years of manufacture, size, grade, how many were made, and more. Everything you need to know is here at GruenWristwatches. This site walks Gruen fans through several techniques case style number, movement number, etc.
After the s, Hamilton stopped producing its own movements, so the Ranfft database above can be more useful. Dan has restored countless Hamilton watches and describes the process for each on his blog, complete with detailed photos. The Pocket Watch Database is a good place to start, but if you really want to know something about your watch, The Illinois Watch and Its Hamilton Years by Fred Friedberg is the be-all, end-all source. The book set covers everything you could ever want to know about Illinois wristwatches, far beyond just age.
Open the hinged cuvette gently. Do not apply lubricant to a stubborn watch case, as it may damage the case or the watch mechanism. Search for an inscription on the inside of the back cover and the inside of the cuvette. This is where many manufacturers noted what type of metal the case was made of, typically either nickel, silver, gold filled or solid gold. A serial number might also be inscribed here, but that is the serial number of the case, not the watch itself. Look for inscribed markings on the back of the watch mechanism, under the cuvette.
This is where many manufacturers inscribed the name and location of the factory that produced the watch. Locate a raised lip or indention on the back of the watch. This indicates a snap back case, which can be opened with a dull tool not a knife or a fingernail. Insert a dull tool or fingernail into the lip and open the case. A special tool called a case knife is created just for this purpose — it is thin enough to pry the back off, but not sharp enough to damage the case or cut your hand.
Notice whether the back case has six notches around the edge. This indicates a screw back case, which can only be opened with a special adjustable case wrench. Adjust the wrench so it fits snugly into three of the notches and turn counterclockwise to open. Later on the serial numbers were made easier to locate. On most vintag Tissot watches you will be able to find the serial number engraved into the watch movement. While your are at it remember to note the calibre number of your watch it may come in handy some day.
Search here. Home Watch Guide Serial numbers by year. Certina serial numbers by year While Omega keeps the serial number on the inside of the backcase Certina leaves the serial number visible on the out site of the watch back case accompanied with a reference. Omega serial numbers by year Together with a reference number, the brand Omega placed their serial numbers on the inside of the backcase.
Eterna Calibre numbers by year In some cases, such as the watches produced by the brand Eterna, serial numbers were not used as markers to know the year of origin.
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