1 Dollar - Elizabeth II Coronation of Mindaugas: 6/6

Mindaugas was crowned King of Lithuania on 6 July 1253 — the only Lithuanian ruler ever to hold a royal title recognized by Rome, having received a papal bull from Innocent IV the previous year. His reign lasted less than a decade before he was assassinated in 1263, after which Lithuania reverted to a grand duchy and never again held a Western-recognized kingship. The date 6/6 in the series title refers to this being the sixth coin in a six-part issue.