Tempera on wood, gold ground
Metropolitan Museum of Art, 65.14.4, Gwynne Andrews Fund,
This is the usual iconography for David: the crown, the throne, and the harp. In this case the harp is pictured as the Renaissance instrument known as the "psaltery."
One of a set with Abraham, Noah, and Moses. Possibly they flanked an altarpiece.
Read more about images of King David.
Photographed at the Metropolitan by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.