Flag of w:Brandenburg-Prussia 1657-1701

IMPORTANT: Until 1701, when the Electorate of Brandenburg acquired the title 'King in Prussia', the sword and septre and royal crown SHOULD NOT APPEAR (with there being an electoral cap in place of a crown)
Armoiries_électeur_Brandebourg.svg
https://www.fotw.info/flags/de-br_hi.html
Armoiries_électeur_Brandebourg.svg: Odejea
derivative work: Amber and Black (talk)