In 2005 to celebrate the History of Powered Flight, the Royal Mint on behalf of the Solomon Islands released a very Limited Issue Sikorsky VS-300 $25 Twenty Five Dollar Silver Proof Coin struck in solid .999 Silver weighing one ounce of pure Silver and plated in 24 Carat Gold.
The reverse depicts the Sikorsky VS-300 while the obverse features a portrait of Her Majesty Queen Elizabeth II by Ian Rank Broadley.
These legal tender coins have been struck to proof quality using specially prepared dies and highly polished blanks.