Princess Castle is a subtheme of Duplo that consists of 6 sets that as of now ran from 2005 to 2007. As of today,
4826 Princess and Pony Picnic is the most valuable set in Duplo Princess Castle with an estimated new/factory sealed value of $237.52.
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 Princess Castle Princess and Pony Picnic set 4826 was released on October 24, 2007, retailing for $20, it has since been retired. New, unopened sets are valued at $238, used ones can be found for $33.
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