375 Castle is a 779 piece Castle-themed set first produced in 1978. It includes 14 Classic Knights and four brick-built Horses. This set was sold for about 6 years, from 1977 to 1983. The USA version, 6075 Castle, did not come into production until 1981. It was one of the first Castle sets. There are 6 1x1x1 windows, the last appearance of this size window in any set. A large sticker sheet was included, for the various heraldic designs needed on the breast-plates, shields, flags, and Castle walls.