This Limited edition Munktiki Black and White Skull mug was a premium reward for a Kickstarter program. It was to support a game designed by Beardo Games and only 25 were made.
Collector Gallery
Tiki Mug Design
Colored Skull Mug
in 27 collections
Each of these skulls has a limited edition run of 25 for its particular color (green, pink, purple, yellow). Additionally, there is a multi-colored Dia De Los Muertos version, a Halloween Pumpkin version, and an open edition with a traditional ivory colored skull with brown detailing around the teeth and eye sockets.