Tombac

In older use, the term may apply to brass alloy with a zinc content as high as 28–35%.

[1][4] The term tombak is derived from tembaga, an Indonesian/Malay word of Javanese origin meaning 'copper'.

[citation needed] Tembaga entered Dutch usage concurrent with their colonisation of Indonesia.

Likely, the term was used generically to describe Indonesian high-copper brass items, including gamelan gongs.

Ure notes the following forms of tombak in widespread use during the time the text was published (1856):[5] Piggot states the brass used for machinery and locomotives in England was composed of copper 74.5%, zinc 25%, and lead 0.5%, which would make it a tombac according to Ure.

Ottoman tombac ewer and basin set – 1870 – Collection of Turkish and Islamic Arts Museum – Brought to museum in 1926 from the tomb of Sultana Pertevniyal
A "bronze" medal (actually tombac) from the 1980 Summer Olympics