5 Dollars - Elizabeth II Vivat Regina: 4/6

Part four of a six-piece series issued to mark the 90th birthday of Elizabeth II, the year she surpassed Victoria as Britain's longest-reigning monarch. That milestone fell on 9 September 2015, and the commemorative trade in Commonwealth mints ran hard with it through 2016. The Solomon Islands, a realm under the Crown, participated through the standard licensing arrangements that route such issues through private minting houses rather than any domestic facility.

The 65 mm diameter places this squarely in the oversized bullion-collector format that became commercially dominant in the 2010s.