Flag of the German Sea Rescue Society or Deutsche Gesellschaft zur Rettung Schiffbrüchiger - DGzRS. It features a fimbriated red cross pattée on a white field with a black border. Based on an image found here: https://www.alamy.com/stock-photo-flag-of-the-dgzrs-the-life-savers-german-maritime-rescue-lifeboat-34634423.html?imageid=C076FD3B-75A6-40E9-AF90-6E02C910C2FC&amp;p=54809&amp;pn=1&amp;searchId=fee1cb14af25220121ab0960fd2c842c&amp;searchtype=0
Own work
Shorepine