Very rare 19th century educational poster

Very rare educational poster on cardboard, 19th, music education. Method invented in 1820 by guillaume louis bocquillon dit wilhelm who was the precursor of music teaching in elementary classes. The poster bears marks of time and its history but is in very good condition, given its age (more than 150 years), blue-indigo outline. Dimensions: 49.5 X 34 cm.

Ref. : 9QUWD73E