A vintage 48-star national flag of the United State of America, manufactured by Reliance, is a historical emblem representing the United States during a significant period in its history. With 48 stars arranged in a field of blue, symbolizing each state within the union at that time, and alternating red and white stripes, this flag captures the essence of the United States during the mid-20th century. Flags with 48 stars were used from 1912 until 1959, spanning events such as World War I, the Great Depression, and World War II. Circa the mid 20th century. American Modern Era Flags and Historical Collectibles.