Telegram, floating-safe, Internment, Parcel Post Settlement and Postal Order Stamps

Quality: ✉

1923/24/8, 6 letters with BK 1 to BK 6, each with additional postage from Hilversum to Surabaya (Indonesia), posted as registered post in Amsterdam, registered post slips enclosed, also including a memorandum from the Amsterdam postal dispatch dated 27 August 1923, extremely rare!, very fine