481-3 Slopes and Slopes Double 2 × 3 and 2 × 1, Red (The Building Toy) Supplemental · 1966 Niet te koop
481-4 Slopes and Slopes Double 2 × 3 and 2 × 1, Blue (The Building Toy) Supplemental · 1966 Niet te koop
481-5 Slopes Regular, Double, Angle, Valley and Corner, Red (System) Supplemental · 1966 Niet te koop
481-6 Slopes Regular, Double, Angle, Valley and Corner, Blue (System) Supplemental · 1966 Niet te koop