Picked this up earlier today. My second reel-to-reel deck, and my first portable reel-to-reel. Concord Automatic 350, reversible tape deck. For the auto-reverse to function, the tape itself needs a metal strip near the end of the reel, similar to what 8-track cartridges use, so that the auto-reverse function is triggered. It can be reversed manually via the white "REVERSE" button. The auto-reverse compensates for the tape reels being "fixed" in place by a center screw, as it's not meant to be user-removable (although I'm pretty sure people did it anyway) Insides: pre-1966 Panasonic logo: Pre-1966 logo for reference: Turns out it was also sold as a National RQ-158S. The only issue I currently have is, no audio output during recording/playback.