If you soon work a J643xx station then it’s some of the operators on St Lucia signing this special prefix to celebrate the 43rd anniversary of independence. For example: J643BP (J69BP), J643DS (J69DS), J643KZ (J69KZ), J643MV (J69MV) + possibly others. Activity begins February 20th until the 26th. QSL via ops instructions.
Picture above is of Frans, J69DS (J643DS)