Thank you so much Vayolene. The third one I should have discovered myself, but the first and second ones not: my Michel catalogue does not provide the right illustration, only another value where the value is in a quadrangular value box. My stamps are without value box. Still you are sure of your allocation?
Cor, Nice to talk to another Dutchman! In case you are not aware of this, but you can Google this. "Japanese occupation of Central China", and you get quite a bunch of posts. Click on the "Images" button and you get oodles of different overprints.
Last one on first row : China,1948,Michel # 864 Fourth one on first row : China,1945,Michel # 646 First one on second row : Japanese Occupation of North China,1942 Second one on second row : China,1946,Michel # 724