F.H. Kok of Tjilatjap in the Netherlands is listed as having two entries in the FIRST INTERNATIONAL SALON OF ART PHOTOGRAPHY THE HAGUE 1904 (EERSTE INTERNATIONALE SALON VAN KUNSTFOTOGRAFIE ‘s GRAVENHAGE 1904 779. Maneschijn.  780.  Een vondst.

When this photograph was published in 1904, F.H. Kok was a resident of Tjilatjap, then part of the Dutch East Indies. Indonesia declared independence at the end of World War II, in 1945,  leading to the Indonesian War of Independence. Indonesia and the Netherlands made peace in 1949. 

Cilacap Regency (Javanese: ꦏꦨꦸꦥꦠꦺꦤ꧀ꦕꦶꦭꦕꦥ꧀, also spelt: Chilachap, old spelling: Tjilatjap, Sundanese: ᮊᮘᮥᮕᮒᮦᮔ᮪ ᮎᮤᮜᮎᮕ᮪) is a regency (Indonesian: kabupaten) in the southwestern part of Central Java province in Indonesia. Its capital is the town of Cilacap. -Wikipedia

Editorial comment for this plate:

With the plate.   (translated)

The photo which served in the manufacture of the enclosed plate entitled: Beach at Tjilatjap, we received from Mr. F. H. Kok there, who hereby wishes to express his thanks for his goodwill.

We expect that our subscribers may also take pleasure in it.