WOW! I just got the same one here in Southern Oregon. Its the exact radio you have, with cassette recorder am/fm. It says "HONDA motorcycles MAGNAVOX", that i not a sticker, it is OEM.
Wanna know whats awesome about mine? Its brand new. I have the original box, instructions and there are zero scuffs scratches and everything works great. It even has the original packing material. The model is D 8260 and it is called the "Cubic Combo" by magnavox. The Magnavox website has no information and this was the only site I found on a google search with anything that was close at all. It has a 3 band equalizer and a "mic" and headphones plug in.
The date on the directions booklet says 1/86. Im guessing thats the date....
I wonder what thing thing is worth? I figure it was win/win, it looks amazing and I wouldnt mind just keeping it if it wasnt a valuable item. I might put it on ebay and see what happens.
I have tested it, the radio works both am and fm, but I do not own a tape (never have) to test the tape deck. The guy I bought it from said he had owned a Motorcycle store for years then went out of business. He does not remember when/how/who or anything reguarding the radio (bummer).
I am a first time poster and tried to include some pictures, I hope they worked! Thanks Dustin in Oregon