Following OVERPRINT stamps from China are all forgery. It is selling as replica FAKE China Overprint stamp.
Don't know when this Overprint stamps from PRC were issued.
It's very easy to overprint stamps by using latest technology in printing.
Some looks like it's using India money or British India money. (Annas).
This is similar to India Oveprint stamps from Princely states during British India with all states names on it such as Gwalior, Nabha state, Jhind state, Chamba states.
Also lot of overprint stamp with Gandhi SERVICE overprint from India along with British India stamps of King George, King Edward and Queen Victoria.