The correct terminology would be Tripled Die.. not triple Like Doubled Die Where do you see Tripling?
Sometimes it really is hard to tell which is which. True Doubled dies can look shelf like and Machine doubling can look the opposite. With machine doubling though, it is caused by bounce of the die when it strikes. This bouncing will shave metal off of the sides of the devices and will make them smaller than the original, as your coin shows. Text book Machine doubling.
