I Need Some Help Identifying These Stamps

I was recently cataloguing my China/China area stamp collection an am stumped
the attached stamps. Any help identifying these stamps would be appreciated



Thank you!
Jacksstamps

3 : Japanese Occupation of Central China,1943
4 : revenue stamp from Japan
5 : postal savings stamp from China,1943

2 : Chinese stamp overprinted for postal savings use,1943

Thank you so much for your help; it is sincerely appreciated! I was unsure as to whether stamp #1 was just a smugged cancel or local overprint. Regardless, thank you so much for your time and expertise!
Jack Searles
Jacksstamps

Just to close the loop, based on the information vayolene provided,
Stamp #2 Per the China Stamp Society Catalogue is Postal Savings stamp #PS133 CV$18.00
Stamp #3 Per Scott is a China Japanese Occupation of Shanghai/Nanking #9N7 CV$.25
Stamp #4 Per Barefoot SE Asia Revenues Japan Sales (Trade) Tax Stamp Barefoot #5 CV$.30 and
Stamp #5 per the China Stamp Society Catalogue is Postal Savings stamp General definitive issue #PS252 CV$1

This helps end some of a year long frustration in attempting to identify these stamps!
Again, many thanks to vayolene ands all that took a look at the stamps submitted!