Chris' explanation isn't as detailed as Kent's, but it includes pictures which can be very helpful.Sometime in the next week or so, I will be moving my website from one ISP to another.Elgin shipped their first wristwatch in 1910, and later manufactured the first wrist watch to be qualified for railroad service, the grade 730A B. In 1958, they introduced the "Dura Balance," an ingenious design for a free-sprung balance (no regulator pins) which used spiral balance arms and small weights to govern the moment of inertia of the balance.They also produced the only American-made automatic wristwatch movements: grades 607, 618, 760, and 761.The really good news is that Elgin has now ceased trading as a company.
This makes Elgin one of the most commonly collected vintage watches since there are still so many examples available at reasonable prices. Their success can be attributed to their huge production of low to mid-grade watches... Together with the Waltham Watch Company, they dominated the huge market for mid-grade watches, producing over one-million per year during their peak years of production.While it is open, make sure you record everything written on the movement of the watch and the watch case. A good description of how to open a pocket watch case and background information can be found here, thanks to the work of Kent Singer.Opening wrist watch cases, especially ones made after around 1950, some times requires special tools.It is very important to not use the serial number on the case because that is completely unrelated to the movement serial number.Table of Contents How to Open a Watch Case Why the Movement and Case Serial Numbers Are Unrelated Are Case Serial Numbers Useful For Anything? "Jeweler Marks" Accuracy of the Estimates of When Watches Were Made The Better Way to Determine the Date Serial Number Data Table While opening a watch isn't rocket science, a watch can be damaged if you try to open it incorrectly. If you really aren't sure what to do, take it to one of your local jewelers and ask them to show you how to open it.