New movement and case model number system. Runs from 8xxx? to 17xxx.Įarly movement and case model number code system - using first 2 digits of 3-digit movement number, plus a 3-digit or 4-digit case code. "J" pre-fix to the numerical digit indicates an extra fraction of a ligne, probably 1/2 a ligne. Seiko Unique (Daini Seikosha), Seiko Marvel (Suwa Seikosha), Seiko Lord Marvels with Marvel-base mvovement (Suwa Seikosha), Seiko Cronos, 6105s (Suwa Seikosha).ĭial diameter in lignes and fractions of lignes system - 5 numerical digits, with the first numerical digit beginning in 1. Non-date serial number system - new SEIKO 5 SPORTS. Some stainless steel Seiko Uniques and Seiko Marvels. No case serial number and no movement serial number:
#SEIKO MODEL NUMBER LOCATION SERIAL NUMBERS#
No case serial numbers but with movement serial number The watch has a 30-minute counter in a single subsidiary register located at 6 o’clock, along with a day and date indicator at 3 o’clock, but lacks any additional registers and a sweep. Looking at the numbers and text on the case back Japan A, Made in Japan, the letter 'A' stands for the location of the SEIKO factory. Technically speaking, the Seiko 6139-6002 is a very simple timepiece, and was Seiko’s first attempt at making a mass-produced automatic chronograph model. Most serial numbers are year-month, but some earlier ones from the 1950s and 1960s are month-year (do month-year 6105s go into the 1970s?) From the Dial at 6 oclock you can read the Caliber for almost all Seiko/Orient Models: 6F24 - 701L R 3 6F24 Movement or Caliber 701L R 3 Dial Reference number 2.
Seikos can have an 8-digit serial number, 7-digit serial number, 6-digit serial number, no case serial number but with movement serial number, no case serial number or movement serial number, or a new non-date serial number system.
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