Always liked the look of these, been after a minty boxed one for a very long time. Finally got one today , looks to be be unused Also came with original receipt from Comet dated 24/11/86 price £19.94
congratulations looks beautiful, I am not sure whether or not this one was made before or after sony WM-504 was made. If this one was made in 1986 then GRUNDIG is the first company to make a clear cassette lid model.
Just had a look on Hifi Archive at the Grundig catalogues and the Beat-Boy 120 first appears in the 83/84 edition.
It's lovely to see such boxed models, even more in this case with such a rare and beautiful one. Great acquisition for your collection.