July saw the company's sales up 35% year-on-year, beating the previous record set in June. This followed on from a successful May - its third best month.
Duplo added that August was on course to beat this record and surpass even July's sales.
The company's direct sales business was up 40% in the three-month period, in comparison with 2009, while its direct dealer arm increased by 10%.
In addition to the succcesful sales, the manufacturer has been shortlisted for Best Product Launch Campaign at the B2B Marketing Awards 2010, which is set to take place on 25 November at the Honorable Artillery Company in London.
Marketing manager Peter Jolly said: "This was a company-wide exercise that shows what is possible when an entire company focuses on the same goal. We had some fantastic samples packs produced, delivered by our staff from all different parts of our business and the printers were a real part of the success, they really got into the spirit of things."