In 1977 LEGO released 11 Duplo sets. The largest Duplo set from 1977 was
524 DUPLO Town with a piece count of 54.
The LEGO DUPLO theme was introduced as far back as 1969 and is designed for children ages 1 to 5. It features DUPLO figures which are much larger than minifigures and DUPLO blocks which are about twice the length, width, and height of a standard System brick. Like LEGO System, DUPLO also has subthemes that are often junior versions of System themes, like Pirates and Castle and licensed themes like Disney and Super Heros.
1977 LEGO Sets
In 1977, LEGO released several new sets and themes, including the LEGO City theme, which introduced models of city life such as houses, stores, and vehicles. 1977 was also the year that LEGO introduced the LEGO System, which was a standardized system of bricks and connectors that allowed for more flexible and versatile building. The LEGO System included a wide range of bricks in different colors and sizes, as well as new elements such as windows, doors, and roofs. Other notable sets and themes released by LEGO in 1977 included the LEGO Space theme, which introduced new models of spaceships and alien minifigures, and the LEGO Castle theme, which expanded upon the castle sets released in previous years.