I have this same model at home. It was inherited from my late father who bought it new over 50 years ago.....
those Grundigs are real Grundigs - unfortunately that brand also stopped existing (only the name survived on cheap discounter-consumer electronics), great unit
Some details https://www.radiomuseum.org/r/grundig_satellit_6001.html Was it made in Portugal? Some Grundigs were including the two Yacht Boys I have. Some company history. https://www.grundig.co.uk/about-grundig/history I found the price of a Yacht Boy in an old advert and not surprisingly it was several £100s when adjusted for inflation.
Grundig/Minerva had a big factory in Portugal, Like a Philips/Radiola, Pioneer and Onkyo/Savana. This material from these brands was easy to find.