Castle is a subtheme of Duplo that consists of 10 sets that as of now ran from 2004 to 2008. As of today,
4785 Black Castle is the most valuable set in Duplo Castle with an estimated new/factory sealed value of $1,164.00.
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 Castle Knights' Castle set 4777 was released in October 2004, retailing for $50, but has since been retired. New, unopened Knights' Castle sets are valued at $300, while used sets can be found for $82 in good condition.
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