1/2 inch magnetic reel to reel tape, no markings anywhere. : r/whatisthisthing
Type B videotape - Wikipedia
RTM LPR 90 1/4" 1100m NAB Reel – Thomann Elláda
Capture 914 Reel to Reel Audio Tape on New 10.5 Inch Metal Reel With Box, Quarter Inch x 2500 Feet - 1/4" Tape - Reel-to-Reel - Blank Media - Duplication.ca
Reel to Reel Tape Recorder Manufacturers Multi-Track - Museum of Magnetic Sound Recording
3M Reel to Reel Tape 1 inch For Sale - US Audio Mart
Reel-to-Reel, Cassette and Digital Audio Tape
Reel to Reel Tape Recorder Manufacturers Multi-Track - Museum of Magnetic Sound Recording