< Budget Watch Collecting
Most Seikos have a relatively simple code--The first letter of the serial number is the last digit of the year, the second is the month, using N for November, D for December. If the production dates of the movement are known, and they were made for less than 10 years this works well. Some movements that were made for a long time are more difficult--The 7009 for instance was made longer than 10 years, so the exact date can be difficult. One clue can be the number of digits--From about 1960 to 1967, Seiko used 7 digit serial numbers. In 1967 and 68, they used both 7 and 6 digit numbers, and from 1969 on, used exclusively 6 digit numbers.
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![Seiko Serial Numbers Seiko Serial Numbers](/uploads/1/2/5/8/125884074/568810481.jpg)
Serial Number: The serial numbers on modern Seiko models are comprised of 6 digits. The first digit indicates the year, the following character the month and the remaining 4 digits a unique production number. Feb 24, 2017 All Seiko Watch Numbers Decoded case movement number Year manufactured - Duration. Seiko SKX007K vs SKX007J (and the SKX009K vs J).