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.
1972 LEGO Sets
In 1972 The LEGO Group officially expanded to the United States. After a licensing disagreement with the Samsonite Corporation, LEGO USA was established in Brookfield, Connecticut and Samsonite ended production of LEGO products in the United States but continued production in Canada. As far as new parts and production, 1972 saw the release of the first boat hull, wing, propeller and helicopter rotor parts as well as new parts including the 1x6 arches. The train theme continued to grow and a number of notable train sets of 1972 included set 181 Train Set with Motor, 180 4.5V Train with 5 Wagons and 724 12V Diesel Locomotive.