19th century provenanced human skull, from Boelongan (East Borneo).

The skull had been in a private Dutch collection, and the original owner was Dr. Henri Polak (married with Fanny Sandbergen).

The skull cap is originally cut into two halves, and connected to eachother with brass wire.

Dr. Henry Julius Polak was born in Paramaribo, and later became a Dutch KNIL officer,  active in Boeton and Surabaya in the early 1900's. 

He also did anthropological research.