I got a head ache trying to date. Slimline shape. Stamped on bowl: KBB in clover leaf, Drinkless, Kaywoodie. Reverse Suntan, Algerian Buyere, number 7066. Bowl bottom : Syncrosystem, Pat app. For. Stinger large ball with pat number. Now the mystery, the bowl bottom has 2 drill holes. Bottom outside of bowl also has a small U with ball tops. Stem has a large elongated clover. Transition pipe 1920’s or ?