From the photos on Ooga Mooga, most of these have the words Tiki Bar painted above the "mouth". One of mine is brown and does not have anything painted there. Could be a prototype or color test, although not marked as such. My other is yellow and marked #1 of !, Artist Proof.
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Collector Gallery
Tiki Mug Design
Ku-Bar Mug
in 8 collections
The Ku-Bar mug was designed and produced by Notch. The mug is based on his larger than life Ku Bar. The brown mug, shaped like Ku, and a bar in his belly and a pocket behind his eyes for dry ice.