LEGO Duplo bricks are designed for young children aged 1½ to 5 years. Duplo bricks are twice the length, height and width of traditional Lego System bricks.

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What do factory markings on the inside of DUPLO pieces mean?

In addition to LEGO and DUPLO names embossed inside the pieces of early DUPLO figures, there are a variety of number formats (one to three digits, some hyphenated) and in the case of 1977, the year. ...