The double-concave profile of this pen sets it apart from what we're used to seeing. At first glance this looks like an unfriendly pen to hold. However, it is quite comfortable - you grip it on the front half of the pen with your knuckle in the recess, and then the back half of the pen, where it's recessed, rests against the soft flesh between your index finger and your thumb.
This pen was made as a custom order through the Design Your Pen feature, as part of a set with a matching jumbo chess queen. Through that feature it was $42.50. If I had the materials in stock without having to make a special order, it would have been less. Order a matching pencil for a Pen and Pencil Set.