Hy beautiful redditors, I need some wisdom.
I am trying to find-out how and where the practice of flipping the national-flag upside down started in the Netherlands. I know it started with the US army as a distress sign. But I am super curious how, when and where it started in European countries. Does anyone have an idea of a database or resource I could consult to find some images or anything relevant to this? Historical piece also works.
Many thanks in advance.
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