I have a 10 year old Speedmaster 3520.53 chrono that runs about 5 - 10 minutes slow per day. The watch was cleaned / adjusted about 5 years ago at the Omega service center in New Jersey. I live in NY and have been debating sending my watch to NJ again (shipping it makes me nervous) or walking it in to their authorized service center in NYC. Anybody have any preference? What should a service like this cost on average? Also, when I have a watch like this serviced, do the typically polish / buff out scratches and stuff? Just curious.