First, let's get the orientation correct:

The orange stamp on the left - Japanese occupation of the Phillippines (issued in 1943). The four characters at the top of the stamp were the 'clue'.
The brown stamp on the right - Republic of China (ROC) or Taiwan (issued in 1959 as part of the Chu Kwang Tower Quemoy series). The characters at the bottom of the stamp were the 'clue'.