The LEGO DUPLO Basic Sets, released in the 1970s, are foundational sets designed to introduce young children to the basics of building with larger, easy-to-handle bricks. Notable sets include "Building Set" (511), which contains a variety of basic bricks and elements for freeform construction; "Building Set" (513), which offers a more extensive collection of bricks and accessories for more complex builds; and "Building Set" (512), which provides an intermediate selection of bricks for versatile building options. These sets aim to develop fine motor skills and encourage creativity and imaginative play in preschool-aged children.
1969 LEGO Sets
1969 saw the launch of the DUPLO system, introducing double-sized bricks for preschoolers and opening a new age group for LEGO play. The company’s workforce surpassed 800 employees as sales and exports climbed. Trains advanced with new red spoked wheels, and LEGO Futura—an R&D division focused on concept development—was established in Billund. By this time, LEGO’s shift from cellulose acetate to ABS plastic was nearly complete, ensuring stronger and more colorfast bricks.