Thirteen covers/cards, amongst others from and to the Soerabaja Orphan Chamber and those from Malang and Bondowoso, showing several cachets like SOERABAIA ZAISAN KANRI KYOKU type Vr.142, KOO YOO, redirected, 'Alamat tida kenal / kembali sipengirim' (addressee unknown, return to sender), and from Bandoeng, Djakarta, Soerabaja (adviced), Soerabaja- / Simpang and Toeren showing several cachets like KOO YOO. Interesting group of covers