Master Combination Padlock Visible Transparent Back Educational Novelty For Sale

Here's an awesome visual aid that is ideal for demonstrating, in a glance, exactly how simple dial combination locks work!
This is a series 1500 Master Combination Padlock. The rear plate has been completely removed and replaced with a clear acrylic back plate, so nothing inside can hide. Simply dial in the combination (provided), and as you do so watch the wheels in the "wheel pack". You'll see the magic unfold, and it suddenly becomes clear how combination locks with dials work. This same principle is used extensively in safes using dial combinations, except that they have at least one more wheel in the wheel pack to create a complex combination.
This perfectly crafted lock makes a wonderful gift, too -- a perfect conversation piece/visual aid/functioning practice lock all in one.