btw
A yellow stamp (or yellow seal) silver certificate is a World War II emergency banknote issued by the U.S. government for American troops participating in the North African and European campaigns starting in November 1942.
Wartime Security: Standard silver certificates had blue seals. The Treasury printed these with a bright yellow seal so they could be quickly declared worthless and demonetized if large quantities were captured by enemy forces during the invasion (such as Operation Torch).