Seiko GRAND 9S51 Instructions Manual page 29

●PERIODIC CHECK
・Checking and overhauling of the watch (cal. 9S51/9S55/9S56) should be
performed by SEIKO. When you take the watch to the retailer from whom it
was purchased, request that the watch will be checked and overhauled by
SEIKO.
・We suggest that you have your watch checked by SEIKO every 2 or 3 years
for lubrication or damage due to water or sweat. After checking the watch,
adjustment and repair may be required.
・When replacing the parts, please specify "SEIKO GENUINE PARTS."
・Be sure to have the gasket and push-pin replaced with new ones when having
the watch checked.
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