20 Dollars - Elizabeth II Bactrian Cybele Disk, gilded

The Bactrian Cybele disk referenced here derives from a class of ceremonial gold phalera recovered from the Oxus Treasure — the largest surviving hoard of Achaemenid metalwork, discovered along the Amu Darya river in present-day Tajikistan during the 1870s and largely acquired piecemeal by the British Museum after passing through Afghan and Indian dealers. Cybele's presence in Bactrian art reflects the deep syncretism of the region under successive Persian, Greek, and Seleucid influence.

Cook Islands has issued extensively in the gilded silver format for this collector series, with KM#3182.2 distinguishing the gilded variant from a companion ungilded strike.