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6200: Is closely related to the 603 movements though there are differences in the jewel counts.5722: (GS, Suwa, 1963), previously known as the 430 movement.(Crown, Suwa, 1959), previously known as the 560 and 57A movements
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66), previously known as the 436 movement 3140: (Liner, Suwa, 1960), previously known as the 620 movement.2451: (Sportsmatic, 1961, Suwa), previously known as the 245 movement.
#Seiko model number meaning series
The following is a list of the different series that were part of this numbering transition: The first digit of the movement fairly consistently will indicate which line this is part of. The 76xx series that appeared at this time were part of the Daini line, while the 66xx and 62xx were Suwa products. With the introduction of the 4-digit series numbers, an important distinction can be made. This article intentionally avoids discussion of movements which had been retired prior to the 4-digit transition including: Crown, Cronos, and Fairway. Many of the pre-1960s (3-digit) movements remained in service but were simply given new movement numbers with 4-digits. The transition seems to have occurred around 1962-63. The following is a summary of research completed by different Seiko watch fans pertinent to post-WW2 men's watches.įirst of all, as noted earlier, Seiko changed its movement numbering system in the early 1960s. Others appear to be entirely new designs. It is particularly interesting how the different movements are related to each other and which ones were evolved from which. There are also some 66xx oddballs like the 6640 "Disney", or the 66 Schooltime, or the 6660, which is a 21j. The 66 are date-only models, while the 6601-05 watches are not date-only. The 66 appear to be related (they are similar movements), but the other 66xx movements seem less connected. The 3rd digit represents the grade of movement (so a 6246 is higher than a 6206) and the 4th digit represents the type of date display: 1 = no date, 5 = date only, 6 = DD).īut how consistent were they? Does this pattern apply to the 62x, 66x, 83x, and 57x series? There is likely some relationship among 6206 and other 62xx, but to what extent? For example, the 6201, 6220, and probably the 6222 seem to predate the 6206, so how can the 6206 be the base model for the 62XX series? A similar case can be made for the 66xx's, the Sportsmatics. In the early to mid 60s, Seiko seems to have standardized its movement numbers, with the pattern xx06.