This reminds me of the Hawaii Overprint Note of US currency during WW2. Perfectly legal---but marked so that were Hawaii to fall it would not enrich Japan. ht

This reminds me of the Hawaii Overprint Note of US currency during WW2. Perfectly legal---but marked so that were Hawaii to fall it would not enrich Japan. https://en.wikipedia.org/wiki/Hawaii_overprint_note https://en.wikipedia.org/wiki/Hawaii_overprint_note