5 Kina

The Kina was introduced in 1975 when Papua New Guinea severed its currency link with the Australian dollar upon independence. The name comes from the Tolai people's kina shell, a traditional exchange medium in the Highlands and coastal trade networks long before colonial contact. That continuity between pre-contact shell currency and the modern decimal unit is deliberate policy, not coincidence.

The STK prefix on the 2005 dating is a stock replacement designation, meaning those notes were printed to fill gaps caused by destroyed or damaged notes rather than as part of a standard new issue run. Replacement prefixes for Papua New Guinea notes are consistently underissued and harder to locate than the regular series.