Original WWII USAAF Russian Blood Chit With Plastic Envelope

Original WWII USAAF aircrew blood chit. These were issued to air crews that might end up flying over Soviet controlled areas. Intended to identify you as an American to personnel on the ground. It is printed on thin cloth and held in a thin plastic envelope with a button tab. The plastic envelope is a little dirty and yellowed from age the chit itself is in good condition, just a little dirty along the fold lines.