Some of the parts are different in size – you can find the details around here somewhere, but the 3rd and escape wheels have different axle lengths due to the jeweled capping. But to repair, there are some things to consider. I have both of these movements, have for years, and there is no practical difference. But that would be a practice in futility – you wouldn’t gain or lose anything but (your own) time. But that’s a bit of a fancy answer – here’s an easy one: they are basically useless jewels and do nothing to alter performance… To answer your question, as far as complete swapouts go, they are interchangeable. They are lower cap jewels for the 3rd and escape wheels. The extra 2 jewels are on the “lower bridge for 3rd wheel and pinion”. WUS user Biased&Critical explains the comparison in detail: There is speculation that the 7S36 was supposed to eventually replace the 7S26, but that never actually happened. Many enthusiasts refer to this as 2 non working jewels. The 7S26 has 21 jewels and the 7S36 has 23 jewels. The main difference between the 7S26 and the 7S36 is that the caliber 7S36 has 2 extra jewels.
Where is seiko model number series#
Since the size of movement is same as B series, the complete movement can be assembled into the watches which originally have the B series move-ment however, as the parts are not convertible, please use the appropriate parts for each caliber.” -Source: Seiko Parts List/Technical Guide Cal. Construction of the C series is same as B series, but using new parts. 7S26C / 7S36C are replacement caliber of Cal. The difference between B/C in Seiko’s own words: According to the change, we would like you to pay attention to the design of the balance staff when repairing those watches.” -Source: Seiko Parts Catalogue/Technical Guide Cal. 7S watches are changed from caliber “A” to caliber “B” in October 2006 production. The difference between A/B in Seiko’s own words: 7S26 and 7S26A is the first generation of this caliber and are the same. The letter indicates the evolution of the caliber 7S26. Modern Seiko watches, such as the Next Gen Orange Monster, have since been upgraded to the caliber 4R36, making Seiko collectors happy because the 7S26 seen here does not hack and is not hand-windable – two functions that have become more and more popular. Setting Time Backwards/Counterclockwise:.The difference between B/C in Seiko’s own words:.The difference between A/B in Seiko’s own words:.
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