Flag of Borsele before 1962, Zeeland, the Netherlands.
Svg by Arch
<a rel="nofollow" class="external text" href="https://beeldbankdebevelanden.nl/detail.php?nav_id=1-1&amp;index=109&amp;imgid=4399855&amp;id=4335852">Beeldbank Bevelanden</a> SVG is own work.