About LEGO Universal Building Set
LEGO's Universal Building Sets theme was released as early as 1966 but it was not until 1973 that the Basic LEGO sets became known as Universal Building Sets. These sets were produced in two set version numbers, the first was for sets that were sold in the UK, Europe, Canada and Australia. The other version numbers, but for the same exact set with the same box artwork was released in the United States. Most, but not all sets between 1973 and 1981 were sold in both regions.
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.