Unusual vintage silver plated sauce server... I've never seen a tilting gravy dish before, though I've seen tea kettles in many different styles.
This has no makers marks that I could find, but I believe it's 20th century vintage, not an antique. (Though it would fit well in a Victorian style table or buffet setting.)
It's pretty heavily tarnished but looks as though it has very little wear. Stands about 7 1/2" tall overall, pitcher is about 5" long.