I recently came across an exceptionally nice Bennington style U.S. flag (3x5 cotton with embroidered stars & '76). The label states it was manufactured by the Valley Forge Flag Company --- Spring City, Pa. and is marked "Challenger". Anyone have an idea of how to date a flag such as this? Note: The person I got it from really had no clue to it's age but he believed it may have been manufactured around the time of our bicentennial (1976). It doesn't appear to have ever been flown.