I'm afraid I can't help much with these. I've not seen the plaster or gesso type with the bark, before. The Chinese did painted gesso work, but I can't imagine them doing one of Mt. Fuji. However, because I'm not familiar with them doesn't mean they aren't Japanese. I would agree that they are probably post WWII.
Most of what I've seen were made with built up areas of wood or bark and a scene like the top one. The second picture would take a large stretch of the imagination to en\vision a Japanese setting.
Sorry I couldn't be more help on these.
Not saying 'NO' doesn't mean 'YES'.
The foolishness of one's actions or words is determined by the number of witnesses.
Perhaps if Brains were described as an APP, many people would use them more often.
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