The Whale Shark series entry in Perth Mint's broader Discover Australia program, which ran across multiple years and denominations targeting the international bullion collector market. Perth's .9999 fine gold specification — rather than the more common .999 — was a deliberate commercial differentiator adopted in the 1980s to compete with Canadian Maple Leafs on purity claims. The small planchet size makes die wear on these proof strikes appear earlier than on larger format issues, and examples with fully mirrored fields are harder to find than the mintage figures alone suggest.
The Whale Shark series entry in Perth Mint's broader Discover Australia program, which ran across multiple years and denominations targeting the international bullion collector market. Perth's .9999 fine gold specification — rather than the more common .999 — was a deliberate commercial differentiator adopted in the 1980s to compete with Canadian Maple Leafs on purity claims. The small planchet size makes die wear on these proof strikes appear earlier than on larger format issues, and examples with fully mirrored fields are harder to find than the mintage figures alone suggest.