Jumbo Bricks was a small theme exclusively manufactured by Samsonite from 1964 to 1972. The sets contained bricks larger than the normal system bricks, much the same as today's DUPLO bricks. However, unlike DUPLO, Jumbo Bricks are not to a relative scale to standard LEGO bricks. They were marketed towards children from nursery school through to first grade. There were six sets produced for this theme.
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.