Help need to identify these Chinese stamps with overprints, one of the stamps has an additional overprint?
I have these two stamps on fragments of letters/invoices. I only have the SG catalogue to work with, unfortunately I cannot find them in my edition.
I would be interested to learn if they are Chinese stamps used for postage at the time or revenue stamps?
The first stamp looks as if it was printed from a worn plate, the second stamp shows differences in the clarity of the lines etc, could this have been printed from a new plate?
The translations of the black overprints would be most appreciated


Many thanks
Andrew