The case back format described so far continues today with the same general format but there has been a change in the layout and some additional information added over time. Case Construction Mark: One of the additional items added to the case back format was a case construction mark. Initially this was an additional letter that was included at the end of the case number and later moved to waterproof section. The first character indicates the basic construction of the case and if present the second digit represents the deviation from the standard construction.
This guide outlines how the cases are opened and the case construction mark details how the crystal is changed. Click here to download the Seiko Case Servicing Guide. Magnetic Resistance: Another case marking that has been added to some watches indicates magnetic resistance. This is represented as a horseshoe magnet and can have either a single or double bar under it.
The single bar indicates standard magnetic resistance while the double is for enhanced resistance. Battery Change Index: On many Seiko quartz divers there is an outer series of markings that are there to indicate when battery changes have been made on the watch.
The markings will indicate the year number and this is divided down into quarters. When the battery is fitted at the factory the first suggested battery change time will be marked on the case. This is shown as a round punch mark above the relevant quarter of the year the change is expected to occur. On the example above the first battery change is indicated to occur in the second quarter of You can see the batter change gauge index circling the case back and it ranges from to Service Battery Markings: On some divers there will be a five character stamped code on the back.
These marks are often incorrectly identified as some kind of military marking or similar but a much these are due to a much simpler explanation. Once the years indicated on the battery change index has expired Seiko service centers will often stamp the case back when the new battery is exchanged. You can see multiple markings on a watch that has undergone multiple battery changes.
On the example above you can see that the watch had suggested battery changes at second quarter , first quarter As the battery change index finishes in a service marking had to be made in April B and another in February B Case back Examples: Here are a couple of examples of different case backs and the information represented on them.
This watch obviously has a stainless steel case. The serial number indicates the watch was produced in February and has a unique production number of You will be given an eBay link to check the value, useful links such as manuals, etc and for quartz models the battery information.
If more than one date is returned then either I lack data for that Seiko movement or it was made for over a decade. For details of my Seiko movements list click here. For information about how this actually decodes and how to decode a Seiko serial yourself click here also has a video showing how to find your serial number and movement. From your initial contact to after you have your new watch on the wrist. Our number one goal is to make you so satisfied with your purchase that we get the honour of helping you with your next watch purchase.
We will guide you through your whole experience with us. So as you advise I have decided to call it a day for a while. I shall enjoy my watches, both old and new, and rejoice in the great advice you have given me. I ran across a Seiko with the numbers 7N01 5C The serial number is Can you help? Hi Pablo,. Yes, your is from April Sadly, as quartz technology became more prominent, Seiko decided to cease production of affordable automatic chronographs in favor of digital watches and quartz chronographs.
Decipher your serial number here. How to tell when your Seiko watch was made Part 1 Reply With […]. Hi ganes,. Hi Bob,. Sure thing. I have a Seiko watch serial No. Your Seiko is an early model dating from April The movement came out sometime in and those that were manufactured before were made in Japan. Later models were Hong Kong assembled until they were discontinued by the late s. I have a ladies seiko watch that belonged to my mother in law.
Hi Todd,. The movement and caseback number must be known before one can date a Seiko watch. On the back it says 5LH with A3 in a box. Hi Don,. The Lassale sub-brand was conceived when the K. Hattori Company Seiko bought the Jean Lassale watchmaking company in At the time Seiko had proudly designed several ultra wafer-thin quartz movements and they fitted them to the initial Seiko Lassale models.
Without seeing an actual photo, your watch could be from June or The 5L14 is a simple 3-jeweled, quartz movement with no calendar or second hand its sister 5L15 caliber has three hands though. I have a sieko 7ta39 watch, it has chronograph-quartz on the face, it has the moon phase shift option ser number Hi Danny,. What you have with you is a Seiko model SEJJ , which was fully made in Japan and was possibly made on March , at the time the moonphase quartz watch fad began.
Not all used 7T36 watches for sale will have uniform values as it will also depend on the exact model. You might be interested in following the auction to the end to see how high its winning bid will be. Just picked up a Seiko 5 with Thai numbers today. Hi Nongbrown,. Your special Thai numeral, Seiko 5 would be more likely from September and not , because the caliber was discontinued by and was replaced by the current 7s26 caliber.
It has the decision making clout to issue special editions for the local Thai horology market. Therefore a Seiko watch such as yours was likely to have been originally sourced in Thailand and not sold in other countries.
Hi, Quartzimodo. Long time no speak. Thanks for the plug. Regards, Paul. Hi Paul,. Back in my SCWF forum days, there was very little interest or none at all in Seiko Lassale watches and information on them were really scarce.
Hi Quartzimodo. Knowing that, I will be on the lookout for a couple more unique items. This one I found at a Thai Army market. Hi Quartziguru. I have recently finally got back my treasured Seiko or — my first question after five months being repaired the crystal was the issue, I was told.
Two things:. The model number on the rear says , but on the face the number is Which is it and is this common? I have had the watch since new, which gets me to my second question. The watch was bought by a friend for me when he was visiting Port Moresby in Is such a delay unusual or a problem?
The back of my case has the wave design but it says Seiko water resist Japan A then the serial number Steel the second hand has a little round thing at the end of it. Does this ring a bell? I have a ladies seiko two tone dress watch. The front face says automatc, 17 jewels. The back says and , water resistant, s. Steel basse, movement singapore.
What type of battery is needed? Thank you. Hi lisamarie,. Thanks for your question and I apologize for not being able to reply sooner. Automatic watches are purely mechanical and are not electronic. As such, they are powered by a tiny main spring that drives the watch mechanism and do not require any battery whatsoever. Your Seiko watch is a U. By the early s, the caliber was replaced by the with the same features and is still used in Seiko 5 automatics for ladies.
Amazing you are, and I thank you! I know nothing about watches though, like what is a jewel? Is that possible? Does that tell you about what year mine was born? What is the best tool to open the back with? Any help that you can provide would be just awesome for me! Thank you sooooo much for this cool message board! Dear Quartzimodo,. I has 1 Seiko 5 Sports, Could you please help me to know this watch is original one or replica.
Thank you for your support in the future. Sawadee, Mongkol. This is a good question. Therefore your Seiko 5 Sports watch would be a genuine one. Cheers, Quartzimodo. I saw half circle inside it have 3 line. Thank you again. I bought both a ladies Seiko solar and a gents Seiko 5 glass back watch in Dubai last week. The sales assistant wrote the serial numbers on the guarantee but did not say which is for which watch. These do not appear to be serial numbers!!! The number on the ladies watch appears to be 1N I cannot read the serial number on the gents watch as the bracelet blocks my view.
I am now home in Australia and cannot return to the shop in Dubai. Can you help me determine which guarantee is for which watch?
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