Calligrapher Junbao
The inscription is "Junbao Book" and printed as "Junbao". So it is Junbao's work, but it is impossible to verify who this person is. Probably a famous local calligrapher. What Chairman Mao wrote should be "Nothing is difficult in the world, if you put your mind to it". According to the inscription, it was written in the autumn of 2007.