Omega Seamaster automatic 2000

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Does anyone know where I can buy a gasket/O-ring to secure the above watch into its outer casing/jacket?

Also, should there be any kind of seal around the winder/crown button? Should this watch have the word 'cosmic' showing on the face, the presentation date on the back is 1976? Any information would be greatfully appreciated.
 
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Thank you for replying 'zwjk' and 'aleksejeremeev', photos added as suggested to the best of my photographic abilities.
 
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Thank you for replying 'zwjk' and 'aleksejeremeev', photos added as suggested to the best of my photographic abilities.