See p. 180 of Truus Daalder, *Ethnic Jewellery and Adornment*: "Silver-gilt head decoration for bridegrooms ('sertali ruma-ruma'). Indonesia, Sumatra: Batak people; early 20th c, W (spread out) 51 cm. Gilt silver, red wool." We bought this c. 1990 in Amsterdam, where over the years we have found it possible to locate good early pieces, though they are now harder to come by. This is part of the Truus and Joost Daalder collection.