WW2 Japan-Occupied Philippine badge

A kind and generous collector just sent some pictures of very rare badges from WW2-era Philippines. Here is one. The obverse has the two kanji for Philippines (比島) on either side of a map of the Philippines, with a Japanese national flag planted in the center. The reverse says 'Great East Asia War Commemorative. Kaki [unit commander's family name] 6561 Platoon. [Imperial Year] 2601 [1941].'