15 Dollars - Elizabeth II 4th Portrait - King Brown Snake - Platinum Proof

The King Brown Snake — despite its common name — is actually a member of the Pseudechis genus, more closely related to black snakes than true browns. This taxonomic misidentification has persisted for over a century, largely because early settlers named it by appearance and venom symptomology alone. Perth Mint's 2009 platinum fractional series targeting the international bullion and proof collector market coincided with platinum trading above $2,000 USD per troy ounce in the preceding year's peak, making even small-denomination fractional issues genuinely expensive to produce.