This is quite a common multiband radio chassis, made in Hong Kong and sold under various brand names. I have one badged
Elftone Globemaster
The Binatone Worldstar appears to use the same chassis in a slightly different cabinet - see here:
https://www.radiomuseum.org/r/binato...ar_014451.html
You can buy the service data from this forum's sister site:
https://www.service-data.com/section...4451-worldstar
Hopefully that should help. Most of the faults with these radios are caused by dirty waveband switches and volume / tone controls.