Nice watch I would defo get it serviced and try not to wear it to much if the winding is stiff ! IMO there could be some damage or it could be very dry either way not good and needs work .
I can recommend Brendan on here Webwatchmaker send him a PM , Is there any watch or clock shops near you ?
You need someone who is good with vintage watches for a sympathetic resto , crystal looks good after a Poly watch and its up to you if you can live with the scratches . I only replace a original ,if the scratches are really deep or cracked.
Good luck with it and dont forget to update this thread when you have got the work completed , maybe useful to somebody else .