50 Cents - Elizabeth II Arch Rivals

The "Arch Rivals" series from the Solomon Islands sits in a well-established tradition of Pacific island nations licensing their sovereignty to third-party minting operations — in this case producing low-cost gold-plated iron novelty pieces aimed squarely at the themed collectibles market rather than numismatic circulation. The Solomon Islands 50-cent denomination has no meaningful role in the domestic economy at this face value.

Iron as a coin substrate is almost never used by serious sovereign mints; it corrodes under plating failures and has a noticeably different heft than bronze or steel.