I started designing puzzles in 1982. That was roughly the same puzzle, but without the 2 cylinder obstacles. The task of this puzzle: remove the ring in the center. I sold 40 of them. 3 collectors sent me the solution. Warning: it is a tricky puzzle!!
A fun puzzle for children. 9 pieces, front red, back blue. And 4 eyes. 9 pieces and 4 eyes. Booklet with fun assignments. Or make your own figures or faces. Main assignment. Make 4 different red JD monograms. Make 4 different blue JD monograms. Material Acrylic. Example:
Old puzzle. Copy produced by puzzle design Ton Delsing.9 cardboard pieces. The puzzle was patented in 1911, This variation on Thurston's puzzle was used as an advertisement for soap. The idea was to arrange the cards so that each center circle contained four different colors and each half circle contained two.