This is a 19" Rack mount for Collins S-Line equipment, such as the 32S-series transmitter, 75S-series receiver or 30L-1 Linear Amplifier. It's in excellent condition, and doesn't appear to have been used. The number rubber-stamped on it is 548-1322-005K. I also have some rack mounts for other S-Line gear. This one is $110 plus Postage. Please Email direct if you'd like additional pictures: email@example.com
Moving to a smaller place, so the BAs have to go!