The Vintage Folding Opera Glasses 2.5x by Compass Industries Inc. from New York are a rare and unique collectible item perfect for those interested in optics and binoculars. These opera glasses offer a 2.5x magnification, making them ideal for theater performances or any outdoor activities where a clear and detailed view is needed. With their compact and foldable design, they are convenient to carry and use on the go. Perfect for collectors or enthusiasts of vintage scientific equipment.