MINGZE 3D Wooden Brain, 9 Pieces, Teaser Puzzle Key Lock, Intelligence Toy Chinese Game, 3D IQ Puzzle for Children, Teens, Adults, Challenge Your Logical Thinking and Decoration Idea: Amazon.de: Toys
PADLOCK KEY IRON Tricky Puzzle Rare Vintage Lock Old Antique Style Square 3 Key $102.40 - PicClick AU
Vintage Classic Key Lock Puzzle Metal Brain Teaser IQ Test Toys for Adults Kids | eBay