Thanks. The old man whom I bought it from was the original owner, and it sat in a drawer for 30 years before he sold it to me. He's not sure that he ever had it polished, he says he just wore it every day for 5 or 6 years and then put it away. It still has a lot of the original finish, and that little bit of extra history, although he couldn't remember how he'd dinged it.
I had it serviced in Summer 2014 and it was running +2.5 sec/day before it settled down to within 1 sec/day. In 2016 it was running anywhere between -0.1 sec/day over a 2 week period to +1.1 sec/day over 9 days when I last tested it. It actually keeps better time than my COSC Planet Ocean 9300 or Planet Ocean 8500.
It's been 5 years since that service, but to avoid wearing out parts I retired it to the safe 4 years after the service, until I could get it serviced this summer. Didn't want to have to score parts for an 861 on top of the COA.