Little is known about the Claviano. It was UK made and Patented but the Patent office has no information about what company built them.
I have encountered 3 of them since 1977 in private home ownership.
Various states of repair wear and decay. The Action was a Simplex type with poor repetition and similar in design to the actions in cheaper models of Challen and Boyd baby grands and many others.
Baby Grands are tonally not even as good as a reasonable sized overstrung upright piano as for one thing the strings are shorter so there's less power. Even less power in the Claviano which has no tri-chords as all the strings are mono-chords and bi-chords.
The compass span being 5.5 octaves is hardly any bigger than a folding Yacht piano and musically it would be no use to anyone more advanced than the UK Grade 4 because the music pieces require the playing of notes that the Claviano hasn't got at the extreme treble and bass.
The casework was crude and usually cheap veneered panels. Soundboards used to shrink and swell to the point of splitting the spruce along the joints and grain. So all in all the piano isn't really of much value as a precision musical instrument or as a piano with any richness of tone or finesse of touch. They are rare, and some people think they're museum pieces but I've never seen one sell for any good price because sadly the design was a flawed concept and tried to jump on the 1930s bandwagon of MiniPianos - some of those were awful but the best was the Eavestaff Mini Piano.
I hope that's useful info for you.