I found this at a local dollar store.

Here's the lock in it's packaging.

Here's the lock and keys.

This shows the discs.

The shackle.

An attempt to show the locking ball.
Now, here's what I know about the lock.
-It uses 7 or 8 locking discs.
-It has a double locking ball system.
-The front plate (see the third picture) spins.Possibly to prevent drilling?
-It seems quite solidly built.
-It was only $3.00.
Any thoughts? Anyone have one of these?
I think I might make a cutaway out of it.
Unbreakable