Book of Hours, Flemish? 1490's?
Not sure of the exact placement and time period of this book of hours, the WDB is very hard to get that information out of, they don't put it nicely where one can easily find it.

Cod.Guelf. 84.2.1 Aug. 12° ("Stundenbuch Herzog Augusts d.J.")

http://diglib.hab.de/mss/84-2-1-aug-12f/start.htm