Metal Puzzles - I always got a set for Christmas or birthday, kept you quite for hours, sometimes you managed to get them apart by brute force.
Being a kid in the 1950s
Dime Store Toy Japan Metal Puzzle Rings Circa by SundayzChild, $7.75
A fiendishly difficult to solve puzzle, which upon solving has a secret code inside that leads you to an online three-dimensional vault room where you get five minutes to explore and choose a potential prize-holding safety deposit box!
Cast Cage - Hanayama Metal Puzzle
Steel Dinosaur Skeleton Velociraptor Metal Puzzle Kit Plasma Cut 25 foot
Art & cool pictures
Cast Chain - Hanayama Metal Puzzle
Vintage Metal Puzzles by Petticoatjaneantique on Etsy, £4.50
Another great find on #zulily! Metal Puzzle Set by Schylling #zulilyfinds
baby & Toddler Toys
The INTIMIDATOR: A Metal Puzzle That Transforms Into A .45 Caliber Muzzle Loading Pistol