Need Help Identifying Chinese/Japanese Coins

#2 Imperial China Qing Dynasty; Qian Long Tong Bao(Pinyin), Ch'ien Lung T'ung Pao(Giles-Wade); 1 cash; Board of Public Works, Peking.
#3 Japan 10 yen 1952; reeded edge type; Showa era year 27.
#4 Japan 5 yen 1987; Showa era year 62.
#5 Japan 5 yen 1997; Heisei era year 9.

G'day, re the PRC coin: the coat of arms shows a building, under the five stars.
The building is Tian-An-Men, the Gate to the eye of Heaven. It was the entrance to the Forbidden City, and dates back to the 1420s. To the south of Tian-An-Men, the building, is Tian-An-Men Square, a 60-acre plaza. On the west side of the Square is the Great Hall of the People, and to the east, the National Museum. At the southern end of the Square, is Mao's tomb.
It is a little surreal to stand in the Square, facing north, and hold a coin up, to compare the image to the reality. I like the Chinese coat of arms, for that reason.
Peter in Oz