This is Respooled KODAK Double-X Black and White Negative Film. Kodak and Double-X are trademarks of Eastman Kodak Company.
Kodak Eastman Double-X is a high-speed, general-use panchromatic black-and-white negative film for both outdoor and studio use. It has a nominal sensitivity of 250 in daylight conditions and 200 under tungsten lighting, and it provides very high sharpness, a broad tonal range, and a fine grain structure.