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
In 1964 LEGO expanded production and built a plant in Hohenwehenstedt, Germany. Also, LEGO introduced the 1x1 round brick with square tapered bottom and the first LEGO sets containing instruction manuals were introduced. In 1964 LEGO released the first of a new series of basic sets. These sets were larger, reflecting the new scale of the system, and packaged in an updated box design. The 040 and 050 sets were released in 1964 and were followed by four additional sets the next year. It marked the end of the venerable 700/x series, which had been introduced 15 years earlier.