I believe the top line reads: Tei-koku Yu-bin or Postal Service of Great Imperial Japan. The figure in the middle of this is the chrysanthemum or kinrisan no mom ( Shield of the father of the House ), symbol of the Royal family of Japan. The bottom line means 'Straits Settlements'. This was one stamp out of a set of 6 that was available from January 1943 in the Straits Settlements and the Dutch East Indies. Probably need to mention that this was a Japanese Occupation stamp.
The top line reads from right to left and says basically what you said, Greater Japanese Empire Post Office (or Postal Service, or even just Post).
But the bottom line just presents in kanji the old-style characters for 15 sen (again, reading from right to left). So this is just a regular Japanese stamp, and I believe it's Scott 259.
However, there _are_ some tricky occupation stamps where the design is the same, but the characters at the bottom indicate which occupied area it is.
I'll just add that in my increasing dottage I am always subject to correction, so if I'm mistaken about the stamp's identification, please don't hesitate to let us know!
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