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.
1964 LEGO Sets
1964 brought major innovations in both product and presentation. LEGO introduced full-color instruction manuals with isometric diagrams, replacing box-top model photos and ushering in the modern instruction format. The first new Basic sets, 040 and 050, replaced the long-running 700/x series, expanding scale and part variety. LEGO also opened a manufacturing facility in Hohenwestedt, Germany, strengthening European production. That same year, LEGO appeared at the New York World’s Fair within Denmark’s national pavilion, featuring exclusive promotional sets.