cybrxkhan
Asian Xwedodah
For China, although I'm not sure where you would find it, here are my suggestions for era flags:
Ancient: Shang dynasty oracle bone script, OR something Zhou Dynasty
Classical: "Han" Character (Han Dynasty)
Medieval: "Tang" or "Song" Character (Tang/Song Dynasty)
Renaissance: "Ming" Character (Ming Dynasty)
Industrial: "Qing" Character, or Chinese dragon (Qing Dynasty)
Modern: PRC flag
Ancient: Shang dynasty oracle bone script, OR something Zhou Dynasty
Classical: "Han" Character (Han Dynasty)
Medieval: "Tang" or "Song" Character (Tang/Song Dynasty)
Renaissance: "Ming" Character (Ming Dynasty)
Industrial: "Qing" Character, or Chinese dragon (Qing Dynasty)
Modern: PRC flag