This is a nice original brass priming cup for a hit and miss gas engine or tractor.  It is in as found condition from an old shop and measures about 11/16 inch in diameter and about 2 5/16 inches tall.  The lever seems to move as it should.  The 1/8" npt threads are in good shape and this priming cup should be ready for use.  It would also make a great spare on the shelf for a future project.  The pictures tell the story.  I can be reached at: 262 573 193 1 if you'd like to talk about it.  Good Luck.