Description
1904 St. Louis World’s Fair Postcard Palace of Mines Hold to Light Unused. This officially issued souvenir card displays a grand architectural view, with impressive towers and flag-lined roofs reflected in the water. The unique "Hold to Light" feature reveals lit windows and reflections when held against light, creating an illuminated effect. Original 1904 St. Louis World’s Fair “Hold to Light” postcard, featuring the Palace of Mines and Metallurgy. This officially issued souvenir card displays a grand architectural view, with impressive towers and flag-lined roofs reflected in the water. The unique "Hold to Light" feature reveals lit windows and reflections when held against light, creating an illuminated effect.