This is in excellent shape with the original instructions!
Performer brings on stage a tray on which a thick glass goblet containing some loose links of a chain. The individual links are poured onto the tray and the glass is shown empty (it is un-gimmicked). The links are then poured back into the glass. They are then thrown into the air where they form a chain.
Clever mechanical tray does the dirty work! Use your own goblet (drinking glass).
I like this one! Excellent condition!