60 Year Classic Series is a subtheme of Promotional introduced in 2018 and currently consists of 5 sets. All sets were released in 2018. As of today, the average annual growth of sets in Promotional 60 Year Classic Series is approximately 4.1% per year.
In 2016 to celebrate LEGO's 60th year anniversary of the brick, LEGO group released a promotional subtheme known as the 60 Year Classic Series which released a number of sets that celebrated this occasion and were based on icon wooden LEGO sets pre-brick. These sets represented icon classic wooden LEGO sets with included Classic Wooden Duck, Classic Wooden Bus, Classic Wooden Train and the Classic Heritage Wooden Truck.