The Philipp Plein PWAAA15121 The $kull is a unisex watch that is great for both men and women. With a case diameter of 44 mm. Most striking feature of this model is the skull on the dial. Philipp Plein is an iconic fashion designer and it shows in this watch. The $kull is a quartz watch with a battery. The silicone watch strap is flexible and fits snugly on your wrist