Dome magnifier - Wikipedia

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High-resolution acrylic material,the magnifying lens is crystal,clear distortion-free,optical glass dome is free of any marks or engravings,not easy

40X Crystal Dome Magnifying Glass Acrylic Optical Magnifier, 25MM Desk Reading Loupe Paperweight Half Ball Lens Magnifier for Reading Newspaper Stamps

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Metal disk encased in a dome shaped award from the Atomic Energy Commission : r/whatisthisthing