Puzzle box

Every Christmas, one of my US clients sends me a wooden puzzle. I confess it's something I really look forward to. Some are easier than others ... this is from 2011/12 and I regret to say has been in it's 'opened' form for some months now. Opening it wasn't easy and putting it back together properly has proved even more challenging. 2102/13 was a walk in the park compared to this!
40mm pancake DD ;-)