Like many other nations, France opened post offices in China in the late 19th and early 20th Centuries. These stamps look in great condition, but their value isn't all that high. I would guess about 4 dollars tops for the two of them (and likely less.)
Yes, overprinted. Found in France section of catalog under "Offices in China", 1st stamp early 1900's catalog value of $5. 2nd I believe is an overprinted postage due stamp.
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