Model of a Solar System

The characters of the planets (Mercury, Earth, Mars, Jupiter and Saturn) are written in order but the picture is unidentifiable. Neptune is written at the bottom, confirming that it is a model of the solar system. Since Pluto is missing, it is thought to be made prior to the discovery of Pluto in 1930. The owner was a teacher from end of Meiji to Taisho Period at Tottori Shihan Elementary School and it is presumed that this teaching material was used in his/her science class.