Quote:
Originally Posted by padi56
Seiko re-issued a limited edition of the "Astron" in 2000 that used a special version of the 9F movement that was rated to ± 2 seconds per year after adjustment cannot get more accurate than that for sure.
Now certainly the Japanese movement accuracy was much better than the Rolex Oyster quartz movement.
Note 2: The 9F movement is reportedly designed to run fifty years before it needs servicing.
Note 3: Other Grand Seiko quartz models use the 8J movement. Even less is known about this movement.
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The Seiko 9983 'Superior' movement issued in the late 1970s was rated to 5 secs a year. My bog standard GS SBGT235 with 9F only gained 2 secs all of last year. GS removed that '50 years with no service' line from all their marketing a few years ago, though.