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Below is some usefulinformation on Seiko watches and the Seiko watch company. There are some linksto Seiko specific web-sites, resources, book recommendations and accessories.If you know of something which should be included on this page please let meknow and I will add it.All modern Seikos watches have the date of manufactureincluded in the serial number which is stamped on the outside of the watch caseback. Seiko also stamp the case back with the movement calibre number and casemodel number.The serial number.The first number represents the year.The second number (or letter) represents the month (1-9 for Jan.-Sept. And O,Nand D for October, November and December). Thus the serial number 8N1234 woulddecode as as follows: -8N1234 = The first number in the sequence is 8 so this could be 1968,1978,1988 etc etc.8 N1234 = The second number in the sequence is the month. Thus this watchwas produced in the month of November.To narrow down the exact decade you need to gooff the case style and the type and calibre of the movement fitted to get someidea as to which decade the watch was produced in.
Information avaialablefrom a number of examples indicates that 7 digit serial numbers first appearedaround 1960. In 1967 and 1968 Seiko appears to have used both 6 and 7 digitserial numbers and from 1969 onwards all 6 digit serial numbers.8N 1234 = The other digits in the serialnumber are the sequence in the production for the particular month.Case and calibre numbers.The case and calibre numbre are placed togetheras two sets of four digits joined by a dash. Thus the case number 5M63-0A10could be broken down as follows: -5M63-0A10 = The first four digits are themovement calibre number. 5M63 is a Seiko kinetic movement with Day/Dateand six month power reserve.5M63- 0A10 = The last four digits are the case or model number. 0A10is a Stainless steel Divers model with rotating besel. Links to intersting SeikoWebsites- Discusion forum for collector and enthusiastsof Japanese watches.More coming soon.
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Seiko Divers Automatic Men's Watch Item No. Black dial with luminous hands and dot hour markers. Minute markers around the outer rim. Dial Type: Analog. Luminescent hands and markers. Date and day of the week at the 3 o'clock position. Seiko caliber 7S26 automatic movement with a 40-hour power reserve. Scratch resistant Hardlex crystal. Most Seikos have a 'retail' model number that is displayed in the store but not written anywhere on the watch. They also have a 'reference' model number that is written on the case back. This reference model number is a combination of two numbers: movement caliber; case code.
Seiko Watch Corporation has been designing and manufacturing quality watches since 1881. Each Seiko watch has a unique serial number that can be used to identify the specific series, model and year of the watch. Because Seiko produces a variety of designs, styles and brands, the serial number becomes the main identification tag for each product. Although the serial number may be difficult to see unless you use a light and a magnifying glass, deciphering the model number will help you identify a genuine Seiko watch.