Here's the 1680 in question: http://www.ermitagejewelers.com/WatchView.aspx?category=40&ProductID=4489
The weird hour markers are on the dial itself and are not caused by the domed crystal. It's a pretty specimen but the bezel is the other thing that seems off to me. The divots in the bezel aren't the deep rounds ones typically found on 1680s. I don't believe it's original which is probably why this watch is priced the way it is.