These are unused capacitors from NASA/JPL surplus from the 1962. They are made in Bradford, PA by Corning Glass Works. I have tested several of these at random. They are nearly all within 5%. Some I have tested were as much as 8% above. The glass is unmarked, but are all from the shown box. These were specially made for JPL for their space program. Many of these went up in the Explorer, Ranger, Pioneer and Tiros satellites. These are extremely nice and work very well in audio applications. They of course can also be used in very high and low temperature setting and can also withstand radiation. Please reach out if you need these at any specific quantity. I can likely oblige.