SEIKO Spring Drive 系列 就這2款 再舊一點是5R64 5R65 VS 5R66: There is also a caliber 5R66 with a GMT complication. All other specs are the same other than the GMT.
Crown/Stem Removal: To remove the crowna nd stem on the 5R65, make sure the crown is in winding position. Press the detent button (setting lever) gently until the stem can be extracted. Pressing too hard can damage the datewheel.
Service/Repair: At the time of this post, Seiko calls for all repairs and overhauls to be sent to Seiko Watch Company in Japan for service. They will not provide any movement parts to watchmakers.