5 Rupees Centropyge bicolor

This piece belongs to Indonesia's 2016 commemorative fish series, which drew from the country's extraordinary marine biodiversity — the coral triangle centered on Indonesian waters contains the highest concentration of reef fish species on earth. The bicolor angelfish chosen here is native to those reefs, and the series was issued partly in response to growing international focus on Southeast Asian marine conservation policy.

Aluminium bronze was specified for the run, consistent with Bank Indonesia's shift away from cupro-nickel for commemorative rupiah issues during this period.