Designed and Made by Bill Cutler 1994, level 7, 4 holes, notchable.
(Cherry, 2.25 inches)
Bill Cutler credits Stewart Coffin with the idea of making burrs with slanted pieces in a way that restricts the number of possible assemblies. Cutler then found a non-unique level 7 burr from his computer analysis which became unique when made with slanted pieces. Slide F forward, slide E left (pulling D with it), slide E forward, push D right, slide F back, slide F right, remove A: