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The second digit indicates the month, and the last 4 digits the production number, which is unique to the watch. The first digit in the number will indicate the last digit of the year the watch as manufactured. IWC WATCH SERIAL NUMBER CASE NUMBER SERIAL NUMBERThe format for dating it via the serial number is as follows: The good thing is that you can use the serial number of your Seiko to date it in order to know when it was produced. IWC WATCH SERIAL NUMBER CASE NUMBER HOW TOHow to date your Seiko watch with the serial number As an Amazon Associate, we may earn from qualifying purchases, at no extra cost to you. To the best of our knowledge, it is correct, but typos or mistakes may exist. Note: This article is for informational purposes only. In some cases, part of, or all, this information, is indicated on the inside of the case back, which means you need to open it in order to access it. This includes the date of manufacturing, the movement type, case material, the maker, how to open the caseback, and more. Each Seiko watch has a serial number that is unique to that exact watch.įurthermore, the case back of a Seiko watch reveals a bunch of different information. The serial number contains six digits and can also be found on the case back. The number on the Seiko case back consists of one number, a hyphen, and then an additional number. IWC WATCH SERIAL NUMBER CASE NUMBER CODEThere, you will find a number that actually refers to two different numbers – the case code and the caliber (movement). ![]() The numbers on a Seiko can be found on the case back. Seiko watches are equipped with several different numbers. IWC WATCH SERIAL NUMBER CASE NUMBER SERIAL NUMBERSBut at the same time, the recorded databases of the serial numbers are rarely shared with the public, but used and kept by the company alone. Most important, it helps the manufacturer keep track of each and every single watch they produce. The serial number has a number of different purposes. With that said, all Seiko watches are equipped with a serial number. This is especially true for luxury watches and mechanical watches that are made not only as a means of telling the time but also to appreciate. The vast majority of timepieces feature a serial number. Dig in! Background to Seiko serial numbers To help you identify the year of your Seiko, and to understand when it was made, we have compiled a complete Guide to Seiko watches serial numbers. What is a serial number on a Seiko? Where is the serial number on a Seiko, and how can you use it to date your watch? These are common questions that we get from our readers. When I collected vintage American Hamilton wristwatches, none of the movement numbers were the same as the case numbers.Seiko Serial Numbers Complete Guide and Date I'm not even certain that IWC puts both numbers on their paperwork anymore?īy the way, IWC's numbering system doesn't seem so odd to me. Otherwise, you must rely on the original paperwork. Nothing else to do but just accept that this is the way IWC operates.Īs for verifying that the movement was originally cased in the case that it is in, only an IWC Extract of the Archives can confirm this, and I believe it must be of a certain age for IWC to provide this information. Go to "Date Your IWC"Īnd input the numbers. Find a listing on eBay for a vintage IWC that shows clear pictures of the serial numbers of the case and movement. Seldom do the movements and cases even share a common manufacturing date! ![]() ![]() If you have a look at a vintage IWC, say, from the 1950's, you can input the serial number of both the movement and the case, and get a result confirming the caliber of the movement with the estimated dates of production for both the case and movement. All this means is that somewhere in the world there is a Portugieser with a case number that matches the serial number of your Aquatimer movement. Their old archives are organized in numerical order of the movements, with notes regarding the cases they were supplied with when they left the factory.Īs for the serial number of your movement showing up as a Portugieser, it seems you input a movement serial number in a case number search. But it has been this way for so long, I doubt IWC would dare to implement such a change now.Īs IWC was primarily a watch movement manufacturer who contracted with suppliers for cases and bracelets, it makes sense why the movement numbers do not match the case numbers. As for why IWC does not match the serial number of the movement to the serial number of the case, I don't know. Click to expand.IWC uses the same caliber movements across a number of different models. ![]()
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