I have a very old Seiko chronograph watch which I got twenty years ago. I take it into Pykes the jewelers in Birkenhead who send it off for me to Seiko headquaters down south. They have a specailist watch person there who looks soley after the older Seiko's. Mine comes back fully checked and tested and even polished..
Be careful were you take these watches as a lot repairers struggle to cope..