There is a huge following of early Kaywoodie pipes. If you have something in your collection, or happen to find a gem while out and about, there are a few hints here to determine its age. Four numbers indicate an older piece (most of the time), but the real kicker is the stinger - this one is complete. Unscrewing the stem reveals a large ball with 4 holes. Later Kaywoodie pipes have a smaller ball. Size does matter.