Equilibrium . . . a globe pin-burr
a.k.a. UFO (Ultimately Frustrating Object) . . . produced in 1974 by Romany Merchandise Group.
Mag-Nif Inc.'s Third Dimension II
A classic 6-pc burr
Classic 'Chalmers-Detroit' Car
Classic 'Victoria' Train
Except for the fact that the rings are smooth and not geared, this is the giant version of PuzzlesDownunder's Locked Sprockets, with the same pin mechanism .
Astrologic . . . from Mag-Nif Inc.
Reiss Games' The Star .
Also known as Mystic Star by Tresco Plastics Ltd. of England from the 60s .