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Evening guys, just been given an omega seamaster 200m to service, its got an ETA 255561 movement and 1441 on movement, case number is 396.1042. My question is this, can I get a list of part numbers anywhere, I need to renew the case gasket and the stem gasket, the movement keeps great time, although the battery requires replacing as the second hand is skipping 5 secs at a time, but over the last week whilst ive been away it has kept time to the second when sat next to my phone. If it was mine I would just change the battery without touching the movement due to it running so well, should I run some tests on the movement as per the tech sheets from ETA, and if all results are within required specs not strip and clean and lube,? (Don't fix what isn't broken) or go ahead and do a full service ive been told it was serviced approx 5 years ago. I've been on cousins and they stock the gaskets but there are 3 listed and no other information given about them ,hence why I could do with the correct part numbers if possible. Cheers for any help guys