The Silver Lady coin is a special release Server (1st Player) coin to use in place of the cardboard server token which comes with the base game. Beyond just looking cool, it has an interesting history and place in the lore of the World of Destiny.
"Queen Callista II was born of the Von Leehold dynasty, but born in exile during a dark period in the history of the Kingdom of Elderon. Her great-aunt Queen Callista I was assassinated along with most of the royal family during a coup led by corrupt Senators in the pocket of the zealous Order of Light in an attempt to end the dynastic line and instill their own theocracy to rule the kingdom.
At the age of 19 in 538 NA (Novem Aurora), Callista II banded together with the remaining Senators and other Noble families still loyal to the crown and reclaimed the throne, executing the spies and declaring the land a constitutional monarchy once more. She ruled from 538 NA until her death in 605 NA. The Silver Lady coin was issued during the first year of her reign, and was produced for the following 100 years after her death until 705 NA."