The 1-kilogram Kookaburra has been issued annually since 1990, making it one of the longer-running silver bullion programs from any sovereign mint. Perth changes the kookaburra reverse design each year deliberately — a policy that drives collector demand beyond pure silver weight, effectively creating a secondary market on top of spot price.
The 2018 issue was struck to .9999 fineness rather than the .999 standard used by many competing programs, a distinction Perth has maintained since reformulating its refining process in the 1990s. At 101 mm across, dies of this size require substantially more press tonnage and slower striking speeds than standard bullion formats — surface quality on these large-format pieces is directly affected by how carefully individual planchets are fed and handled before the strike.
The 1-kilogram Kookaburra has been issued annually since 1990, making it one of the longer-running silver bullion programs from any sovereign mint. Perth changes the kookaburra reverse design each year deliberately — a policy that drives collector demand beyond pure silver weight, effectively creating a secondary market on top of spot price.
The 2018 issue was struck to .9999 fineness rather than the .999 standard used by many competing programs, a distinction Perth has maintained since reformulating its refining process in the 1990s. At 101 mm across, dies of this size require substantially more press tonnage and slower striking speeds than standard bullion formats — surface quality on these large-format pieces is directly affected by how carefully individual planchets are fed and handled before the strike.