I think it's probably a Greco RB-650. There's no serial number, so I believe it's from the 70s. I haven't checked if it produces sound or if it powers on, so I'm selling it as junk for someone who can repair it or use it for parts. I cannot guarantee normal operation. I'm not very knowledgeable, so I can't answer technical questions. Thank you for your understanding. Please check the photos for the condition.