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.
1968 LEGO Sets
1968 was a landmark year with the opening of the first LEGOLAND park in Billund, Denmark, attracting hundreds of thousands of visitors. LEGO also introduced the first 12V train motor, spoked wheels, and magnetic couplers, greatly improving the realism of its Train line. The company refined packaging with photo-based idea layouts and transitioned away from the small-scale Town Plan system. This year also marked the arrival of Jens Nygaard Knudsen, who would go on to design the LEGO minifigure and shape future core themes.