A high-quality, precision-machined version of the classic Ball and Tube mystery.
 
A polished steel ball is placed on top of the brass tube. Although the ball is visibly too large to fit through the opening, it slowly descends completely into the tube and then rises back to the top. The apparatus can immediately be handed out for examination with nothing added, removed, switched or palmed.
 
The specially constructed double tube incorporates a concealed reverse-threaded locking mechanism, making this a much more sophisticated version than the common Ball and Tube trick. A beautifully made, self-contained piece of mechanical close-up magic. Original instructions are included.
 
Condition: Overall in very good condition with some minor cosmetic wear from age and use. The mechanism functions properly and operates smoothly. 
 
The manufacturer is not identified. Its construction resembles higher-quality versions produced by Johnson Precision Magic and Viking, but it is being offered as maker unknown.