Please help identify

Very new to this. These came in an auction lot I purchased. Any info would be appreciated greatly.

 

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All of the larger ones read Kang Xi Tong Bao (top-bottom-right-left) and the smaller one reads Qian Long Tong Bao. All from the Qing Dynasty. I can update later with proper Hartill attributions but here is what I can see with Numista.

Top left: Boo-chiowan mintmark, Board of Revenue mint
Top mid: Zhe-je mintmark, Hangzhou, Guangdong province mint
Top right: Same as above I believe
Bottom left: Chang mintmark, Nanchang, Jiangxi province mint
Bottom right: Boo-chiowan mintmark, Board of Revenue mint

 

Also FYI,

The top 3 and bottom left coins are upside down. The bottom right coin needs to be rotated a quarter turn to the left to be oriented correctly.

 

Thank you so much for your response. I will research the Qing Dynasty for time period placement. Much appreciated.

 

Thank you again sir.

 

This site might help.