Hiding place with a labyrinth lock. 

Its easy to close it, but opening it requires strict adherence to the algorithm and an error at any stage throws you back.

At the same time, there are no hints how to open the cache on it body. 

This will be a challenging puzzle for many people.

Internal size: diametr 28 leght 47 mm

Can be used as hiding place

Material: bronze and duralumin.

Size: 92x65x65 mm.

Made to order, time 4-8 weeks

How it made https://youtu.be/jnICSW7SI9s