Instructional alphabetical cubes from the early 20th century.

Wooden boxes with wooden cubes. Date from the early 20th century. Superb typography. The 6 faces of the cube are different, see photo 5. All 30 cubes are present, but some letters are missing and replaced by other letters, which means there are duplicates. This is visible in the photos. Dimensions 27 X 24 X 5.5 cm. Please look closely at the 18 photos to better understand the condition.