100 Sika - Elizabeth II 21st birthday of H.R.H. Prince William

Ghana's commemorative coinage program in the early 2000s leaned heavily on British royal milestones — an odd editorial choice for a republic that had severed formal Commonwealth membership under Nkrumah in 1960, only rejoining in 1994. Prince William turned 21 on June 21, 2003, the same year this piece was struck. The X# prefix in the reference indicates it falls outside mainstream circulation issues, catalogued instead among Unusual World Coins — almost certainly a bullion or souvenir issue with negligible domestic circulation.