Voidlock is an interesting lock puzzle from Jean-Claude Constantin.
This is the metal version and the aim is to open the lock but there is no key. You must move the metal slider and pull the mechanism in the correct sequence to unlock. In total this requires more than 300 moves.
Shipping costs are additional, please wait for a final invoice before paying. I ship using Pirate Ship for the best possible rates. Payment accepted via PayPal (friends and family greatly appreciated but of course not required). Zelle is also possible.