Note: I would add "China Stamps" into a more descriptive title in order to attract more relevant eyes.
Thank you for the clearer images. Obviously you have honed in on the stamps that have the greatest value potential of anything shown thus far. I will be interested in hearing opinions from China experts. The early China and China with overprints can be forgery/fake minefields. The stamps need a trained eye and you may have a great collection here.
Likely will still need to post clearer images in order for a proper review. Do you have a scanner or access to one?