If you find one, please post what make, model and what the official name
was. Also, give an idea of the size and what it coped with.

I wanted such a thing 8 years ago to try and remove as many stones/gravel as
possible from my previously paved garden before I sowed my lawn but I never
managed to find one, or for that matter anyone who immediately understood
what I wanted!

Cheers,
Paul DS.