Hippopotamus-safe 3

So my last customer ordered anoher work. A hippopotamus-safe. This one demanded not just an art idea but also really a lot of inventiveness - I had to invent a conundrum-lock. And not the only one.
I wanted to create something bitween the safe from the Gringotts Bank, steam-engine and military gear. I used antique opera binoculars, the napkin holder, casings from anti-tank weapons Oerlikon, furniture handles, pendulums of clocks, the clarinet, gears, neodymium magnets and printing proofs (19th century).
An original way to open "the deposit box" includes several steps, and this allows not just keep any content safe but also have fun with friends - so you can let them feel like a burglar