My favorite would be weighted dips with elbows in... IF your shoulders are in good shape.
Close second would be heavy medium-narrow bench press with elbows in, grip slightly less than shoulder width.
I also like seated overhead triceps extensions, done with either a single heavy dumbbell or an ez-bar. I either use a an upright bench with a back rest for the db extensions, or sometimes use another piece of equipment at the gym that has a bench at a slight incline, and has a front support to rest a barbell/ez bar.