Items:Granddad's puzzles

Many of them were made of wood, having been collected back in the days before plastic choked the environment. Types I remember:

1. "Chinese puzzle boxes" which would be opened by slightly sliding sequential sides
2. Metallic / wood puzzles designed to be taken apart
3. A wooden puzzle with a penny inside. To this day (Aug 2012), we haven't solved it.
4. A plastic puzzle called The Brain which I eventually learned how to solve in about 20 seconds.