I had a similar issue once after picking up a 'NOS' Seamaster mid-size years ago from a grey dealer in the UK. Brick and mortar shop, guarantee was honored w/o issue, sent to Omega for full service and returned with receipt to the shop then myself. That shop is gone now, but if the dealer you purchased from does similarly it should be a fairly painless fix. Mine was back to me within about 6 weeks total and worked flawlessly for close to a decade after before unfortunately being stolen. Best of luck!
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