The oldest-surviving bass guitar of its kind helped a New Zealand session musician get work on British television comedies including Red Dwarf and Blackadder.
University of Otago senior lecturer Dr Rob Burns said his 1985 five-string bass was the third made by English company Electric Wood under the brand name Wal.
"The first two got trashed in a car crash so by default it's the oldest one in the world."
The body of the bass was a combination of walnut and mahogany sandwiched between Santos rosewood, Dr Burns said.
Inside were "more electronics than you can shake a stick at", which gave the instrument a far broader tone sweep than a standard bass and made it ideal for recording.