Please Help Identify Asian Stamps Not In English

Cannot figure out which country these belong to, any help is much appreciated. Thanks!

First one : North-East China (year 1949)
On the second card : 2 stamps from Japan (year 1913) then 2 stamps from East China (year 1949)

Second one : East China,1949,Michel # 87
Third one : looks like a faulty copy (cut with scissors ?) of a chinese stamp from 1932 (Michel # 255)

Vayolene, I cannot thank you enough. Much appreciate the help with identifying them, now I can place them in the correct albums.

Look for key symbols. Mao is always going to be the PRC.

Sun Yat-sen (once you recognize his face) is nearly always Republic of China, either early before the PRC or later on Taiwan.

The Chinese character with a rectangle pierced by a vertical line is "China" (Middle Kingdom).

"Sen" or "Sn" is an older Japanese currency.

The stylized circular chrysanthemum flower with rounded petals is Japan.

The Republic of China symbol (before the PRC in 1949 or on Taiwan) is the star (or sun) with rays coming out of it.

A figure-eight character is "Ni" as in Nihon or Nippon which means "Japan"