This vintage electronic tube from National Union Radio Corp is a rare find for collectors and enthusiasts alike. With its model U.S.N. 3C27B, this tube is a piece of American manufacturing history. Made in the United States, this tube is a testament to the ingenuity and innovation of American engineering. Its box adds to its value as a collectible item. Not only is this tube a great addition to any vintage audio or video collection, but it also serves as a piece of art. With its intricate design and impressive craftsmanship, it is a beautiful and fascinating piece to admire. Don't miss your chance to own a piece of history with this National Union Radio Corp electronic tube.