Here is a photo of my two 24 inch model Bahco 86. One is pre 1950 and has a smooth shaft and stamped markings. The other is post 1950. Both have 45 Deg angle heads. You would have to say they are both 3rd Generation - early and late. The 86 and 87 models started being produced with 22.5 deg heads I think as of Generation 5 - 1984 on. Very late ones, Generation 6 will have the Bahco fish symbol, a divider on the shaft about half way, measurements in mm, and vernier markings on the jaws