Early Structures

Notable parts

• 2 moulds appear in no other set: Activity Card, Set 9660-1, Parts Inventory; Activity Card, Set 9660-1, Teacher Notes.
• 15 parts appear in only a few other sets: Activity Card, Set 9660-1, Card 1 - Green Creature ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 10 - Spinner ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 11 - Goal ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 12 - Seesaw ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 13/14 - Bridge & Viaduct ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 15/16 - Caterpillar & Balance Tower ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 2 - Falling Towers ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 3 - Dangling Bunny ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 4 - Walls ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 5 - Balancing Crane ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 6 - Table ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); Activity Card, Set 9660-1, Card 7 - Book Ends ([No Color/Any Color]) — also in 9660-3 (all Educational and Dacta); and 3 more.
• 4 parts are otherwise only found in Educational and Dacta sets: Duplo Technic Brick 2 x 4 with 3 Holes (Red) ×4; Duplo Technic Wedge Belt Wheel (Yellow) ×4; Duplo Tile 2 x 2 (White) ×4; Duplo Technic Axle 6 (Light Gray) ×2.

Calculated from Rebrickable’s public set inventories, excluding sticker sheets and spare parts.