Return it if you can. Sucks to buy something only to spend time and money fixing it
Yeah, except Omega is a different game and you're looking at around £430 for a full service. Very few watchmakers will take apart your watch and examine each component to see if it is okay. At that point, might as well get that full service.
Sounds like he bought it from a pre-owned place that gives a warranty on their watches. Most of the online dealers do this, as do bricks and mortar stores. If he likes the watch and the price paid he might as well have it repaired under warranty.
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!
