3 Pin Best Cylinder?
One of them was a Best Interchangeable Core Mortise Cylinder. I started picking on it not expecting to open it any time soon. It opened to control within a minute or two.
When it dropped out I was not as impressed with myself when only 3 of 6 pins were populated.
Why would someone populate a cylinder like this? By skipping every other pin and going all the way back to the 6th pin they made a stupid easy lock to open and require a long key as well.