Treen Puzzle Bank
Open the bank.
These weren't necessarily made to be a puzzle but rather to keep people out. But you can make this a puzzle - how do I get into the bank? I've also collected other vintage coin banks that have interesting mechanisms.
Treen Puzzle Bank
Open the bank.
Six Panel Bank
I believe it's an impossible object rather than disassembly.
Little Gem Bank
Coin holder
Little Millionaire Bank