Indochina, Allegory of Peace with new value Overprint, 1903, Michel Nr. IND 22-23; The 15C Allegory of Peace stamp in lilac-grey was overprinted with a new value of 5C and the 25C blue/red stamp was overprinted with a new value of 15C.
Here is the mint 5C on 15C value.
and here the postally used 15 on 25C value
Registration Nr. 090040