Model is: 77-805UK In good used condition.
It is also known as the 'Portapak' as it was designed to be used as a portable unit.
It does not have the portable case, DC Power supply or microphone but it runs with a generic 12V DC adapter.
It does not have an internal speaker or antenna but you can connect an external antenna and speaker.
For the tech-savvy, an image of the schematic is included and the Service Manual is also available in PDF format.