The middle row appears to be postal savings stamps. Further information is available here (e.g. from the Research Association for Chinese Philately in Germany):
Thank you André for the URL's ! The middle row, second stamp from left I found "W. Sichuan Freimarke 1942 und 1946. The middle row, stamp most on the right I found it is a Chinese postsaving mark. I could not detect the most left and 3th from the left on middle row. PS: the book is not available on the moment but on the lead I could read some of the pages. Thanks!
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