I still have my black watch,and what's more it works as well now as it did when it was new. (sadly).
In 1974 Prof Eric Laithwaite gave the RI christmas lectures attended by clive sinclair (and by me!). Laithwaite had a bee in his bonet about gyroscopic anti-gravity. In the new year CS set up two guys in a room at the st Ives rivermill playing with gyroscopes until some wag pinned a fake letter on the company notice board.
Dear Sirs, I recently purchaced a Sinclair Anti-gravity belt from Dixones for 39.99. All was going well until, at a height of 50 fee, one of the two hearing-aid battery clips (enclosed) flew out of the case....
The project was quietly cancelled.