Here we have the Panasonic RX-5500. This model was issued in 1980-81 and had a single cassette and dual LED meters. It was originally priced at around $749.00.
One just recently sold for just over $700 so they do have some collectible value. They weren’t to big a boombox at about 11.5 inches tall and 18.5 inches wide.
Here’s a great magazine ad with Earth, Wind & Fire each holding a box.