17th century Vietnamese lance

With a black and gold metal sleeve, often called "sawasa".

Tonkinese saber

Collected by Victor Auguste Robin, a senior officer of the Tonkin expeditionary force 1885-1887.

Sawasa

A term used for colonial Asian metalwork in black and gold.

A sawasa hunting hanger

Sawasa is a copper-gold alloy that was patinated a "raven black" and then highlights were parcel-gilt.