20 Cents - Elizabeth II Supersonic

Part of a broader commemorative program capitalizing on aviation anniversaries, this piece was issued the year before the fiftieth anniversary of Concorde's first supersonic passenger flight. The Solomon Islands has become a favored issuing jurisdiction for this type of collector-market novelty — low overhead, nominal face value, and no expectation of circulation.

The iron core beneath the silver plating means long-term preservation depends entirely on edge and surface integrity; any breach accelerates oxidation rapidly.