13.2 cm x 10.7 cm x 8.5 cm / 5.2 in x 4.2 in x 3.4 in
The Overtime box is a multiple step box that is likely to challenge the best of puzzlers. The series II box adds an extra pin and an extra bit of complexity and uses the Skull artwork lasered into the top.
Note that no force at all is required to solve this. Fingertips and brainpower are all you need…
The box externally measures about 5.2 x 4.2 x 3.4 inches (not counting the dials which extend another .75 inches from one side. Internal space for inserting something is about 4 x 2.8 x 2.3 inches. The internal space has a felt lined bottom.