Tick Talk[Moderator Emeritus]
2368
Thanks :-) Additionally...
re the concerns about buying a worn-out movement; back in the day, boxed marine chronometers were routinely "run-in" for months before being sold.
Also back in the day, ie before COSC, Observatory testing was considered the mark of a reliable timepiece. This involved 45 days of continuous testing of the uncased movement, which coincidentally totals 1080 hours!