Construction is a subtheme of Duplo that consists of 8 sets that as of now ran from 2010 to 2016. As of today,
5650 Front Loader is the most valuable set in Duplo Construction with an estimated new/factory sealed value of $220.10.
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.
Summary
Duplo Construction Big Construction Site set 10813 was released on May 22, 2016, retailing for $50, it has since been retired. New, unopened sets are valued at $150, used ones can be found for $39.
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